graphite

pencil

Graphite writing instrument

• sketchHasty informal drawing
• shadingDepicting light and darkness
• charcoalBurned wood residue

illustration · portraiture · crosshatching · stippling · draftsmanship · rendering · tonal · value · smudging · blending

lead

Dense metal, symbol Pb

• writingRecorded language on surface
• mechanicalOperated by machinery
• woodenMade from timber

eraser · drafting · note-taking · stationery · sharpener · ferrule · cedar · grading · hardness · softness

diamond

Crystallized carbon gemstone

• fullereneCage-shaped carbon allotrope
• nanotubeNanoscale carbon cylinder
• elementBasic substance or factor

chemistry · hexagonal · layered · buckminsterfullerene · amorphous · crystalline · isotope · carbonaceous · organic · coal

conductor

One who directs musicians

• electrodeConductive interface point
• electronsNegative charges in atoms
• currentDirected flow of charge

resistance · semimetal · anode · cathode · battery · arc-lamp · brush · commutator · EDM · intercalation

refractory

Resistant to heat/control

• crucibleVessel for extreme heat
• furnaceEnclosed heat-producing structure
• kilnOven for hardening clay

high-temperature · melting · metallurgy · heat-resistant · lining · insulation · casting · foundry · mold · firebrick

grey

Neutral achromatic tone

• metallicResembling ore-based elements
• lusterSoft reflected light
• sheenSoft surface luster

opaque · soft · greasy · silvery · dark · streaky · smudgy · matte · sleek

ore

Metal-bearing rock

• geologyStudy of Earth's composition
• crystallineClear, ordered, brilliant
• flakeThin detached fragment

vein · metamorphic · schist · gneiss · plumbago · mined · deposit · natural · Madagascar · China

friction

Resistance between touching surfaces

• slipperyLacking friction, hard-to-grasp
• lubricitySmoothness reducing friction
• slidingMoving smoothly across surface

film · coating · boundary · anti-seize · colloidal · flake · self-lubricating · wear-resistant · powdered

• art techniquespainting, drawing, sketching, shading, blending
• historical art materialspigment, gesso, tempera, linseed oil, ochre
• cool greysgunmetal, silver grey, ash grey, battleship grey, pewter
• hexagonal mineralsquartz, calcite, beryl, corundum, hematite
• lubricant additivesantioxidants, detergents, dispersants, emulsifiers, thickeners
• pyrolysis productscharcoal, char, wood tar, pine tar, tar