This is such an exciting medium. Here are the only materials you will need. Water-soluble graphite comes in various forms: pencils, pots and sticks. It's purely down to choice. The graphite works in the same way whichever materials you choose. However, we will just look at the water-soluble graphite in pencil form. Similarly to ordinary everyday graphite sketching pencils, we don't need to purchase very many. In fact just three are quite sufficient. A light wash, a medium wash and a dark wash. I have chosen the Derwent pencil set, as you get two of each pencil in a tin. The water-soluble pencils are graded according to their degree of softness (blackness). You will need a sketchbook or sheets of paper that will cope with a small amount of dampness, a water brush, a soft putty rubber and a palette. You could also add some watersoluble coloured pencils.