Pyrophosphate (poly) piperazine powder and production method thereof

Pyrophosphate (poly) piperazine powder, which has a whiteness of 80 to 100 as a value W and a yellowness of 0 to 5 as a YI value, wherein said pyrophosphate (poly) piperazine is a mixture of pyrophosphate piperazine represented by formula (I): formula ** ** wherein, in formula (I), the dashed lines represent chemical bonds and a poly (piperazine pyrophosphate) represented by formula (II): formula ** * * in which, in formula (II), n is an integer from 2 to 100.