I see they are still advertising it as 'food grade' even after some enlightenment. As they tell me it is not suitable for ingestion, I struggle to see this continued use of the term as safe or even completely truthful.
Thankfully, there is a supplier of genuine food grade hydrochloric to E507: APC pure - e.g. 3x1L bottles for £13. Delivery is extra and costly at over eight quid, but then unlike some other unmentionables they don't sneak it through an innocent delivery service hidden in plain packaging..
Sulphuric is harder to find, so yes I went with a high/lab grade for that (again from APC pure in my case). The quantities I would want to use per litre of liquor are tiny, so a product of that high purity will fall well within any ingestion thresholds in practice. Though retailers aren't allowed to sell the concentrated sulphuric to the general public here, so it was relatively dilute.
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