Derivan Liquid Pencil is an innovative new product that allows you to create authentic graphite pencil effects and pencil sketches using a liquid. It has been formulated to be easily thinned with water or MM9 Acrylic Painting Medium (to maintain permanency) and allow for the softest of colours to be applied with a brush, nib, or other art tools. With a creamy consistency, anda different rheology (flow of liquid matter), artists now have a wider scope for creating sketches.Lighter or darker results can be obtained by mixing in a combination of water and medium and the effective layering (glazing) of different shades. Water will allow you to spread it more easily and the addition of MM9 Medium will maintain the intrinsic structure of the product.As with all creative undertaking, experimentation is recommended as there are no precise 'fool proof' methods to achieve exact variety of tones.Due to a precisely balanced formulation another great benefit of the Permanent liquid pencil is that it will burnish up in a similar manner to traditional graphite but it will not smudge. The Re-wettable formula will also allow you to remove areas using water in a similar manner to watercolour techniques. A standard eraser can also be used and while it will remove some of the colour it will not erase back to clean paper. Another advantage to using Derivan Liquid Pencil is that large areas can be built up and covered quickly and easily.