Hero Arts Liquid Watercolours 0.5oz - Coffee - This package contains one 0.5 fluid ounce glass bottle of Coffee Liquid Watercolour from Hero Arts. This is a pigment-based, translucent watercolour. This watercolour is easy to blend and mix. It can be diluted to the colour intensity you prefer with water and will set well when dry. This liquid comes in a glass bottle with an eyedropper screw top for maximum control. This watercolour is acid free and archival.