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I suspected Amazon would probably be full of dropshippers who just overcharge for stuff that's come from a proper chemical supply company. Thanks for recommending Mistral
Supermarket formulations are generally overpriced and often contain not much of chemical you're after.
That was my suspicion, thanks
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Thanks for recommending Mistral
https://sourcechemicals.com/ was where I got the oxalic acid, fwiw
I tend to get from either Amazon or https://mistralni.co.uk/ I could check when I get home where the oxalic acid came from as I have a feeling it wasn't either of the above.
Supermarket formulations are generally overpriced and often contain not much of chemical you're after.