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Re: [APD] carbonate test
I think what you said was that no fizzing with an acid test
wasn't a sure sign -- and that fits what you posted. That's
not exactly what I posted
Thanks for putting it more clearly.
Scott H.
--- Roger Miller <roger at spinn_net> wrote:
>
> Scott wrote:
>
> > I wish I had the scratch paper handy with my notes. I
> > thought I heard Roger say that the acid test as he
> > described it could falsly indicate no carbonates but
> was
> > unlikely to falsely indicate carbonates.
>
> Did I say that? Regardless, it is true. The acid will
> not fizz unless there
> are carbonates present, so you can't get a false positive
> from the test. The
> test can fail to fizz on dolomite (a carbonate) so the
> test can produce false
> negatives. That's why if the test appears to be negative
> it is usually
> advisable to scratch the rock the way Bob describes it
> and test again on the
> scratched surface. It's also advisable to test a rock at
> several different
> places.
>
> The test for dolomite is a little difficult. There is
> also a dye test for
> dolomite but I doubt that many aquarists are going to
> that length to find
> dolomite. Dolomite is soft enough to be scratched, so if
> you use the
> hardness test first then you may never get to the acid
> test.
=====
S. Hieber
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