T1O1U1C3H4S1T1O1N1E1S1
16 points
TOUCHSTONES is validvalid
TOUCHSTONE,
TOUCHSTONE, a highly siliceous (usually black) stone or other stone for testing gold or silver by the colour of the mark each makes on it; (figurative) a criterion, a standard
TOUCHSTONE,
TOUCHSTONE, a highly siliceous (usually black) stone or other stone for testing gold or silver by the colour of the mark each makes on it; (figurative) a criterion, a standard