clay said:So I am gearing up to use a modified Stuart Melvin approach for my small camera negs that I want to print in platinum.
I shall be pleased to learn how you get on. The few negs I have enlarged have been on Bergger BPFB 18 and the results have been encouraging; although for various reasons I have only made very few. I have the film and plan to make more. Stuart Melvin's process was one that I looked at and it seems to be successful but I did not go down that route.
Aurore said:"swimming pool acid is the same thing. You can get it at any swimming pool supply place. They sell it by the gallon, and often in a two gallon pack."
You know, that's what I thought. I'm helping my mother get ready to sell her house, and the last owners turned the carport into a lanai... unfortunately, the carport cement had been painted green, so now the walkway and driveway are bare cement, but one strip of the walkway is partially green with old paint. I was pretty sure sulphuric acid was what we needed to etch the cement with... guess I can split the cost with her. Cool.
As far as battery acid, well, I think I'd rather buy the pool stuff. Must be psychological... same stuff, but somehow pool acid sounds safer than battery acid... :roll:
Aurore said:"It may well be safer to rent a 5000 psi pressure sprayer and simply blast the paint away. Be careful though, I've seen one cut a hole in asphalt so don't point the sprayer at anything that don't need spraying. Especially at people. Going over all the concrete will make everything look more consistent."
Already done it! That's why I said 'partly' green... some of the paint came up, but not all. We did it with the 1 degree nozzle, not sure of the psi. It was a rental from Home Depot.
Thanks for all the info. I will talk to somebody at the store when I buy and will certainly be careful. The potassium dichromate is probably pretty much the same when it comes to safety, and I have the neccessary gloves, safety glasses, and respirator. Should be fun :roll:
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