Novel capillary feed marking instruments capable of producing edible colored indicia directly on food substrates and medicaments are disclosed. The marking instruments are used to write or decorate directly on porous and non-porous food substrates in a controlled fashions and without the need to pre-mix...http://www.google.com.au/patents/US6299374?utm_source=gb-gplus-sharePatent US6299374 - Instruments for producing edible colored indicia on food substrates and medicaments
