Question

how many paper colour of flame

Answer 1

A very fast method for making flash paper similar in size and burning properties to the commercial type is described here. Detailed instructions are given for the preparation, storage, and lighting of flash paper that burns with single colors (red, orange, yellow, green, blue, and violet) or with combinations of these colors. This method requires no more than an hour from the mixing of the nitrating acids to the lighting of the paper and eliminates prolonged drying procedures.