linear

linear (2)

Linear 2 transforms an electric track into an architectural feature.
The integrated metal cartridge works with engineered motor adaptors,
with brackets finished to match for a coordinated finish.

Smart tech meets sharp design.

Leading Motor options

Linear may be specified with your choice of motors from the leading brands. This provides power and control options ranging from standalone battery powered systems to fully integrated home automation solutions.

METALCOAT DETAILING

The innovative, embedded cartridge is paired with precision engineered metal adaptors finished to match the system. Allowing a single or a twin drive which sit discreetly behind the curtain.

Function

Wall fixed brackets may be specified in a matching track finish, incorporating magnetic cover plates.

true Flush

The direct fix ceiling brackets provide truly flush ceiling mounting.

Gliding

Gypsum and Anthracite colours offered as standard for gliders. Metalcoat rollers and Metalcoat Ripplefold rollers available for exact colour match. A low-friction channel coating ensures quieter performance.

LAYERED SHADING

Tracks can be supplied to any length↔, subject to maximum weight loadings of the selected motorised system

MODERN HEADINGS

The choice of motor systems means that modern headings can be accommodated, with both Wave® and Ripplefold® styles available.

BENT TO SHAPE

A bespoke bay bending and curving service is available on all systems to allow the perfect shaped track to fit any bay window.

options

Finishes

Brackets

Poles

Gliding Options

Lutron

Somfy

Silent Gliss

Finishes

All tracks and components may be specified in this stunning palette of colours and finishes, with a choice of coat options throughout.

shades

A superb selection of opaque colours, all available in a choice of Matte, Satin or Gloss finish.

– Matte Coat

View all 24
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Matte, Shades
cloud matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Matte, Shades
alabaster matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Matte, Shades
bone matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Matte, Shades
barley matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Matte, Shades
dusk matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Matte, Shades
cream matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Matte, Shades
mineral matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Matte, Shades
dove matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Matte, Shades
parchment matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Matte, Shades
oatmeal matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals
Finish
Matte, Shades
millstone matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Greys, Neutrals
Finish
Matte, Shades
stone matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
,
clay matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
Matte, Shades
grey moss matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Matte, Shades
cocoa matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens
Finish
Matte, Shades
moss matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Matte, Shades
smoke matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys
Finish
Matte, Shades
frame grey matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Matte, Shades
lead matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Matte, Shades
earth matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Matte, Shades
burnt ash matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Matte, Shades
flint matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Matte
charcoal matte
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks
Finish
Matte, Shades
raven matte

– satin Coat

View all 25
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Satin, Shades
cloud satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Satin, Shades
alabaster satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Satin, Shades
bone satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Satin, Shades
barley satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Satin, Shades
dusk satin
add to basket
Collections
Elevate, Elysian, Float, Glide, Gliderpole, Mio, Steel
Colour
Blues, Greens, Greys, Neutrals, White
Finish
Satin
ceramic satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Satin, Shades
cream satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Satin, Shades
mineral satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Satin, Shades
dove satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Satin, Shades
parchment satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Satin, Shades
oatmeal satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Neutrals
Finish
Satin, Shades
millstone satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Greys, Neutrals
Finish
Satin, Shades
stone satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
Satin, Shades
clay satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
Satin, Shades
grey moss satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Satin, Shades
cocoa satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens
Finish
Satin, Shades
moss satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Satin, Shades
smoke satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys
Finish
Satin, Shades
frame grey satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Satin, Shades
lead satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Satin, Shades
earth satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Satin, Shades
burnt ash satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Matte, Shades
flint satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Satin
charcoal satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks
Finish
Satin, Shades
raven satin

shades – Gloss Coat

View all 24
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Gloss, Shades
cloud gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Neutrals, White
Finish
Gloss, Shades
alabaster gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Gloss, Shades
bone gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Gloss, Shades
barley gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Gloss, Shades
dusk gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Gloss, Shades
cream gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals, White
Finish
Gloss, Shades
mineral gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, White
Finish
Gloss, Shades
dove gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Gloss, Shades
parchment gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Neutrals
Finish
Gloss, Shades
oatmeal gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals
Finish
Gloss, Shades
millstone gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Cream, Greys, Neutrals
Finish
Gloss, Shades
stone gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
,
clay gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens, Greys
Finish
Gloss, Shades
grey moss gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Gloss, Shades
cocoa gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greens
Finish
Gloss, Shades
moss gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Gloss, Shades
smoke gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys
Finish
Gloss, Shades
frame grey gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Gloss, Shades
lead gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns
Finish
Gloss, Shades
earth gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues
Finish
Gloss, Shades
burnt ash gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Gloss, Shades
flint gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Gloss
charcoal gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks
Finish
Gloss, Shades
raven gloss

metallics

High metallic fleck coatings with most available in Satin and Gloss sheen levels.

View all 16
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, Silvers
Finish
Metallic, Metallics, Satin
platinum satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns, Greens, Greys, Silvers
Finish
Metallic, Satin
champagne satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Brass, Gold
Finish
Metallic, Metallics, Satin
gold satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Bronze, Browns, Burgundy
Finish
Metallic, Satin
cognac satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Brass, Bronze, Gold, Greens
Finish
Metallic, Metallics, Satin
antique brass satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys, Silvers
Finish
Metallic, Metallics, Satin
gunmetal satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Bronze, Browns, Burgundy
Finish
Metallic, Metallics, Satin
bronzed satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys, Silvers
Finish
Metallic, Metallics, Satin
pewter satin
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, Silvers
Finish
Gloss, Metallic, Metallics
platinium gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Browns, Greens, Greys, Silvers
Finish
Gloss, Metallic, Metallics
champagne gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Brass, Gold
Finish
Gloss, Metallic, Metallics
gold gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Bronze, Browns, Burgundy
Finish
Gloss, Metallic, Metallics
cognac gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Brass, Bronze, Gold, Greens
Finish
Gloss, Metallic, Metallics
antique brass gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys, Silvers
Finish
Gloss, Metallic, Metallics
gunmetal gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Bronze, Browns, Burgundy
Finish
Gloss, Metallic, Metallics
bronzed gloss
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Blues, Greys, Silvers
Finish
Gloss, Metallic, Metallics
pewter gloss

Anodics

A flat metal colour group, with an anodised style surface texture.

add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, Silvers
Finish
Anodics, Metallic, Satin
twilight
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, Silvers
Finish
Anodics, Metallic, Satin
glow
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blues, Greys, Neutrals, Silvers
Finish
Anodics, Metallic, Satin
sky
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Greys, Neutrals, Silvers
Finish
Anodics, Metallic, Satin
sunrise
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Greys
Finish
Anodics, Metallic, Satin
storm
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Brass, Gold
Finish
Anodics, Metallic, Satin
glimmer
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Silvers
Finish
Anodics, Metallic, Satin
Sunset
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks, Silvers
Finish
Anodics, Metallic, Satin
Night Sky
add to basket
Collections
Drive (2), Elevate, Elysian, ePole, Float, Glide, Gliderpole, Linear (2), Mio
Colour
Blacks
Finish
Anodics, Metallic, Satin
Midnight

ceramics

Finished with ceramic Cerakote for industry leading protection and a flawless finish that endures daily life.

View all 12
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Neutrals, White
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Frost
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Greys, Silvers
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Titanium
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Greys, Silvers
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Tungsten
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Brass, Gold
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Electrum
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Brass, Gold
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Golden quartz
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Bronze, Browns
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
burnt bronze
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Bronze, Browns
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Midnight bronze
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Greens
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Serpentine
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Blues
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Blue titanium
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Orange
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Copper
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Greys, Silvers
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Cobalt
add to basket
Collections
Drive (2), Glide, Linear (2)
Colour
Blacks, Greys
Finish
Ceramics, Matte
Finishing Charge
A finishing charge will apply
Graphite black