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This paper presents a method for the determination of the thickness of gold electroplate, using a punch and die to obtain samples of known small area. Amounts of gold up to 10 micrograms (0.010 mg), corresponding to a thickness of 0.00050 mm (0.00002 in.) or less on 1 mm2 (0.00155 in.2) of surface, are determined directly by means of the color produced with o-tolidine. Results are reported for thicknesses of gold plate on experimentally plated samples and on commercially plated products. CONTENTS Page

A method for determining small amounts of gold, and its use in ascertaining the thickness of electrodeposited gold coatings