Touchstone, used to check the standard of silver and gold alloys utilized by jewelers; It is a easy, onerous, finely grained, black or darkish stone.
TRACKING FEATURE
The touchstone is utilized by rubbing it on the steel to be valued. Initially, the steel to be measured is rubbed on the touchstone to depart a hint. Then, the mineral whose worth (setting) is identified is pushed to the touchstone.
VALUE MEASUREMENT
The 2 traces are in contrast with one another and a worth is given to the unknown worth. With this method used up to now, there was a margin of error of as much as 15 % within the worth of the mine.
#touchstone
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