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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Need Thum Cell Voltage
What is the best voltage to run a Thum Cell and what is the reasonable maximum current density of the cathode?
Sandra Wilson-Melbourne, Victoria, Australia
2001
Thum Cells are usually run at voltages from 3 volts to 4.4volts. I've found 3 volts works well. Current density - amps per sq. foot (anode) 50 to 60. If tartaric acid ⇦this on eBay or Amazon [affil links] is needed to improve the density of the Ag crystals, use sparingly - 1/4 teaspoon per cell at a time, give it a day or two before adding more. If too much tartaric acid ⇦this on eBay or Amazon [affil links] is added, the silver will be like concrete on your cathode.
Good luck & Best regards,
Jim Sivertsen- Alden N.Y. U.S.A.
2003
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