Hello Dave,
I reckon such a stock lasts for ages - could you possibly check the concentration of a fresh can if you get a chance at a store or so, please? I’m sure it’s not concentrated phosphoric acid - probably 10% or less.
The acid in coke is much more diluted - I’m sure it will work but requiring much longer exposure and the heaps of sugar may make this a quite sticky affair!
Regards,
Kai
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