Perhaps the choicest variety is gold graining in a shakudo field.
Then without further addition of alkali the boiling is continued for a few minutes, when the soap is ready for salting out or " graining."
This is done several times, the number depending on the quality of graining that the expert desires to produce.
Like the graining or " milling " on the edge of many coins, the inscriptions were intended to put a stop to the practice of clipping and filing coins, which was prevalent in the 16th and 17th centuries.
The imitating in paint of the grain of different kinds of woods is known as "graining" (see PAINTER-WORK).
