ABRASIVE FRANKFURT 5 EXTRA
The main composition of Frankfurt 5 Extra contains oxalic acid. During the polishing process, the friction created between the stone and abrasive generate heat. It melts the oxalic acid into liquid. Under a chemical reaction, calcium carbonate of marble reacts with oxalic acid to form calcium oxalate which is a shining crystal.

The main composition of Frankfurt 5 Extra contains oxalic acid. During the polishing process, the friction created between the stone and abrasive generate heat. It melts the oxalic acid into liquid. Under a chemical reaction, calcium carbonate of marble reacts with oxalic acid to form calcium oxalate which is a shining crystal.