This tip was passed along from Dave Braddock at Ovation Semiconductor who learned of it from Chris Palmstrom at the University of Minnesota –

To clean the arsenic off of a phosphor screen, put the screen over a slightly smaller petri dish which is about 1/4 full of 30% hydrogen peroxide. After about 2 hours, the vapors from the peroxide have dissolved the arsenic without attacking the phosphor screen. Be careful not to get the screen wet with the liquid peroxide.

Happy etching.

November 21, 2000

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