Rapid fast dyes, indigo sol and Naphtol are reactive print process. Printing with Rapid fast dyes, indigo sol is a little more complicated as the dyes once mixed for printing have to be used the same day. In Rapid Color variation is little difficult and while printing it is not possible to gauge the quality or depth of color, though rapid dyes and indigo sols penetrate the cloth. Standard colors are black, red, orange, brown and mustard. Once printing is done than the fabric is passed through nitrate solution to fix the colors and in this process colors react and change as per desired requirement.