Rolling devices are used to reduce the thickness of the ingot. In the first stage, known as “roughing”, the gold is flattened to only a few tenths of a millimeter. Pure gold leaf is an Nearly impalpable layer of precious steel, obtained by subjecting an ingot to 10 processing phases. https://watergilding67643.uzblog.net/how-water-gilding-can-save-you-time-stress-and-money-36222390