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Letter 34004
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Milt Stevenson,
Jr. |
How to know if depleted? Titrate for sulfuric acid and dissolved aluminum.
Does it ever go bad? Yes
Working strength for dye work? 180 grams per liter,which is 13 fluid ounces per gallon of high quality electronic grade 66 degree Baume sulfuric acid.
For the green dye to be consistent in shade from piece to piece several parameters must always be the same: Acid concentration, dissolved aluminumm, dye concentration, dye pH, dye temperature, anodize voltage different for each alloy.
If the dye works on the chromic acid anodizing and not on the sulfuric acid, then some parameter is off. First guess is acid concentration. Second guess is dissolved aluminum. Third guess is temperature. Call me for the fourth guess.
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Robert H Probert Editor's
note: |
After a sulfuric acid solution has been used and loaded up with "dissolved aluminum" and other dragged in contaminants, the hydrometer reads an error. The hydrometer and cook book tables are only viable for a fresh unused reagent grade sulfuric acid aolution.
Regarding algae, most shops avoid such growth, but once it gets started it is almost impossible to get rid of it.
Some proprietary dye sellers offer analytical services and general telephone technical service to their customers.
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Robert H Probert Editor's
note: |

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