On Dec 20, 10:02*pm, "Paul E. Lehmann" >
wrote:
> 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.

Me too. I'm not color blind but most of my family is so we have used
this for a while.