The traditional RSS production process begins with filtering the fresh latex to rid it of any foreign particles. In the filtered latex some water and acid, typically formic or acetic, is added. The mixture is left standing in moulds for up to 24 hours to allow coagulation, depending on the amount of acid added. The coagulated latex is then pressed into sheets of approximately 0,5 cm of thickness by means of hand or machine powered rollers or even manually using a dough roller or similar device. The final roller has a ribbed pattern, which imprints into the sheet to.