Diluted (non-fuming / safer than concentrated -> I don't advocate using or storing concentrated HCl at all! No need to buy concentrated form. I don't get why concentrated comes into your mind in the first place?) muriatic acid is as close as the nearest Home Depot (pool or garden sections) to ordinary US citizens (it's sold in any supermarket in Turkey for cleaning / "dissolving" calcium residue in the bathrooms and kitchen where the tap water is hard - does that ring bells? Calcium residue -> calcium buffer...) and would be definitely cheaper than buying oxalic acid from a chemicals supplier. No need pure grade; so called technical grade is OK. Also, a little goes a long time since it's further diluted (to final concentration of 1% to 5%). But I'm not in pennies and cents here...
To me diluted (to safe levels) liquid acid is much safer than and easier to weight/operate compared to any powder. Powder can get airborne (and small particles can shed most easily), liquid does not.
Grittiness is a fact to me since I've experienced this more than once, with more than one paper (all when coating with a glass rod). In any case I still think (and will tell people) that HCl or acetic acid (white vinegar) is definitely a better ("right") method for the purpose. My END.
Philosophy of my objection: I don't like the idea of "if the best do it, it's OK for me too" kind line of thought, especially in the "alt" context. It would be better for the novice/less experienced practitioner to provide firm grounds to themselves why they are doing something in a particular way.
Of course it's certainly understandable to prefer (and suggest) oxalic when one stocks and use it for other purposes too, moreso if they aren't experiencing any negative effects.
Now, this sound like the infinite (and useless) discussion (somewhere else) about glyoxal against formalin against gluteraldehyde (in the context of hardening gelatin sizing)...
BTW, I must add that I'm not questioning / discrediting anyone's (including yours) mastery, technical competence and technical / artistic talent here. I deeply admire your pt/pd and gumover pt/pd work and always drive my students to your website for a perfect demonstration of mastery... So don't take it personal.
Originally Posted by Kerik
Last edited by Loris Medici; 04-17-2009 at 12:58 PM. Click to view previous post history.
Reason: (added the "glass rod" criteria)