Derivan Block Ink Medium & Extender is a versatile medium used in relief printing. Add to Block Inks to extend the colour and make them more transparent without loosing the “body” of your paint, Just add from 1:9 to 9:1 ratio of Block Ink Medium & Extender to Derivan Block Ink colour. Up to about 1:1 ratio the colour will be extended, after this the colour will start to become more transparent, or Derivan Block Ink Medium & Extender can also be added to Acrylic colours to create block printing ink from the paint. A ratio of 1:1 Block Ink Medium & Extender to Matisse Structure Acrylic paint colours is recommended.