[Jewelry making - Article 00024] - Re: [Orchid] Sparex No 2 101

[Peter Deckers]

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    Did somebody mention that ALUM (a white crystalline double sulphate
    of aluminium) is a safe alternative to (sulfanilic acid and Sparex)
    pickle? 

    Note 1: I use room temperature 20% Sparex solution (I hate acid
    fumes, for myself and my tools). I use a Pyrex pot. The lit is from
    another slightly smaller Pyrex pot and fits only on its handles. That
    leaves me a very handy gab of say 25 mm around to slight all of my
    hot metals in. The quenching effect (I know this is not recommended
    practice!)speeds up the cleaning. That way I do not have to lift the
    lit. This badly fitted hands-free lit will protect 98% of all of the
    dangerous splatters and fumes. 

    Note 2: What I find most handy is next to the pickle pot a tall
    spaghetti jar with plain water sunken down into my workbench, to
    rinse/quench all of the long bits of metal. A tall heavy grade
    stainless steel tweezer (300mm+) is a handy companion. 

    Note 3: I did once use streaming hot water to get rid of the borax
    after soldering. This was necessary because the work was way longer
    (a very long and wide silver tube) then the diameter size of my Pyrex
    pickle pot. Not all borax can be rinsed off that way (mostly the
    plumbers /lower temperature silver flux will do). This method does
    not dissolve oxides of course. 

    Plain baking soda (bicarbonate of soda) is a great neutralizer. 

Peter Deckers
New Zealand
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