fishziblu wrote:

> Hi I've just bought two tests to measure TA in wine. However both
> tests rely on a colour change of the liquid . Due to me having a very
> deep red wine, I am unable to measure when the transition, even if I
> dilute it 50% with water.
>
> Is there any other method?, or should I abandon the TA test altogether
> and relay on taste for acid content?

No don't abandon the test. It is really quite easy if you have a pH meter.
The color change occurs when the pH reaches 8.2. Simpley add the NaOH as
you normally do and at the same time stir and watch your pH. The end point
occurs when the pH is 8.2. I know, it is not real intuitive that 8.2 is
the end point instead of 7.0 but 8.2 is the point at which the indicator
indicates neutrality. For more information, do a google on titration and
8.2. I used this method for the first time last week and it works like a
charm.