This tin of 24 contains the whole colour range of Derwent Inktense Blocks. These chunky Derwent Inktense Blocks can be used wet or dry, on their own or with other media.
Once dry, the colours are permanent so can be worked over the top of with other media.
There is also a tin of 12 available and individual colours can be purchased.
If you want to add some fine detail then you might like to use Derwent Inktense Pencils with the blocks.