A water-soluble bar made of wax!
With the smoothest texture and the most wonderfully opaque colours so you can build up layer upon layer of thick colour really fast. And then, just add water and dry marks will melt away.
Set of 12 or 24.
A4 soft cover journal sets
The Village Art Shop
Daler Rowney Watercolour pocket set
Derwent Drawing Pencils
Derwent Graphic Pencil Set