On Apr 16, 10:08 am, Lewis Perin > wrote:
> (Scott Dorsey) writes:
> > Actually, I mentioned this to a co-worker who pointed me at:
>
> >http://www.medicalnewstoday.com/medi...p?newsid=43343
>
> > which is an article about a home caffeine test that the Wash U
> > medical school folks are developing.
>
> > The standard old-fashioned test is to mix with an oxidizing agent,
> > then ammonia is added until a color change is seen. In the case
> > of tea, you have to clear the tannins out by adding a little bit of
> > portland cement first... the cement adsorbs the tannins and gives
> > you a cup of clear liquid.
>
> Ugh! I don't mind a touch of ammonia in my cup any more than the next
> guy, but portland cement ... !
>
> /Lew
> ---
> Lew Perin /

My reaction also. The cup you test will not be the cup you drink.
Toci