500g bag - anhydrous sodium carbonate - Na2CO3
1% of powdered soda solution (10g for 1L of water) is necessary for the washing out of the photopolymer films, so evacuating the unexposed polymer and creating the deliberate hallow. It dissolves easily in a temperature of 30°C. For the stripping solution of the films, dissolve 10% of powder soda ash in water. The plate can be so reused in case of working with ImagOn or StellAprint, "non-etch" technic.