The invention herein provides for an improved dye composition for encapsulation in casing structures adapted for projectile motion and rupture upon contact with a target surface, such as paint balls. The dye composition adapted for use in an impact-rupturable capsule of the invention comprises a water-soluble...http://www.google.com.au/patents/US6530962?utm_source=gb-gplus-sharePatent US6530962 - Emulsion of water soluble dyes in a lipophilic carrier
