You can use Inktense pencils dry, but mix them with water and the color turns into vibrant ink. Once dry the color is fixed and you can work over the top of it, and, because it's permanent it is great for using on fabric such as silk and cotton.
Derwent Inktense Pencils, 4mm Core, Pencils
Derwent Inktense Pencil - Sea Breeze
Derwent Academy Tin Watercolor Pencil 12 Piece Color Set
Cretacolor Megacolor Pencil Set, 12 Colors
Derwent Lightfast pencils are oil-based, smooth and creamy and 100% lightfast. They feature a new design of core that is resistant to prolonged color change, ensuring your artwork will not fade for up to 100 years under museum conditions. The thick core gives a dense color application which brings vibrancy to any drawing.
Derwent Lightfast Colored Pencil - Blue Violet
Stabilo Carbothello Pastel Pencil 60 Piece Color Set
Derwent Artists Colored Pencil Tin Set, 6 Piece
Derwent Inktense Pencil - 6 Color Set
Derwent Inktense Color Pencil Set, 6 Piece
Derwent Inktense Pencils Pack 6 George Weil Art & Craft Supplies
Derwent Inktense Pencil Beech Green
DERWENT STUDIO Colored Pencil Set Tin 12 Piece
Derwent 2300217 Coloursoft Skintones Colouring Pencils 6 Tin for sale online
Derwent Inktense Color Pencil Set, 6 Piece
Derwent Inktense Pencils 24/Pkg, Colors may vary