A type of hidden color carbon paper with a direct copy and direct color capability is carbonless copypaper, also known as NCR paper. In order for the microcapsule inthe pigment and oil solution to overflow and come into touch with the color development agentollowing the dyeing reaction, it must be subiected to an external force. mostly used for billscontinuous receipts. multi-link forms. general business receipts. etc. Both blue and black picturecarbonless copy paper is available.