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post #5 of (permalink) Old 11-08-2019, 03:30 AM
Steve E
Join Date: May 2014
Location: North Lincolnshire
Posts: 669

I thought you might like this.....just my two pence worth and putting my money where my mouth is

I got an old oxydised 2p coin and put it in my phosphoric acid. Mine is a commercial strong mix I got to remove rust stains embedded in my tiles around the swimming pool as the previous owner had cast iron furniture sitting on them.

I had to turn off the camera flash to get a picture as it came up so shiny. It does need a wash out afterwards with clean water but only in the jar for a minute.

I may just try the coke test though out of interest.

All the best

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