The idea is for you to print them out and colour them in yourself - in your own style and technique - in order to create a library of reference charts for creating your colour pencil art.
Caran d'Ache Charts
Museum Aquarelle Watercolour Pencils
Supracolor Soft Aquarelle Pencils
Derwent Charts
Graphitint Tinted Graphite Pencils
Faber-Castell Charts
Albrecht Durer Watercolour Pencils
Polychromos Artists' Colour Pencils
Tombow Charts
Lyra Rembrandt Charts
Prismacolor Charts
Prismacolor Premier Soft Core Pencils