The chips can be mixed with hot water to make etching solution. Supplied in convenient chip form which reduces the high carriage charges normally associated with the despatch of liquid etchants.\ Supplied as a 2.5KG Pack - (2 x 1.25KG) Makes 5L 250g - makes 0.5 litre of etching solution 500g - makes 1.0 litre of etching solution 2.5kg - makes 5.0 litres of etching solution