glass colored crumb used for manual color tinting of glass. glass workshop

additive admixture and art artisan artist bars beads blowing colored craft craftsmanship crumb design detail dust dye europe factory flamework glass glassblower glassblowing handle handmade handwork heat industry job lampwork material melting molten mosaic pigment preparation production rack raw rods shape shaping shelf source stock studio tint tinting work workplace workshop workstation