Marshall,
If particles have aggregated and fallen out, wouldn't there be visible crud
in the bottom of the jar? There is NO visible fall out or plate-out at all in
the clear CS with vinegar added....Nor any in the CS which when through peach
to faint pink and (day or two later) went clear also. At which point I
discarded both samples so can't check Tyndall.
Since the last thing I want is CS more acid than 3pH I likely won't repeat
the experiment.
Still nothing falling out of the CS made with a pinch of baking soda, one
batch of which I added 1/4 tsp additional baking soda to after it had been
sitting a few days---that batch is now very pale straw color though. the extra
baking soda upped the pH to about 7.5.
TIA,
paula
----- Original Message -----
From: Marshall Dudley
To: [email protected]
Sent: Monday, October 06, 2003 7:52 AM
Subject: Re: CS>Yellow tinted CS!!
That is expected, when the ph goes too low on CS it causes aggregation, which
the pink indicates happened. Then the aggregation continues, and the particles
either become too big to absorb in the visible spectrum, or the fall out,
either of which will make the liquid become clear. A strong tyndall would
indicate the former, and a faint tyndall would indicate the latter.
Marshall
sol wrote:
Ken, I put a drop of vinegar in a previously made yellow batch of CS
(about 10 oz), nothing happened, so I added a whole dropper full. It turned a
very pretty shade of peach, now, several hours later, it is very nearly clear,
with just the faintest hint of pink color, almost undetectable.... Ok now to
perform your suggested test, I'll report on that later.paula
