silly? phenol question

[SURESH KUMAR K.G.]

On Tue, 14 Aug 2001, Richard P. Grant wrote:

> In article <20010813185927.5664.qmail at ww02.jatek.com>,
>  Tim Fitzwater <TFITZWATER at somalogic.COM> wrote:
> 
> > 0.1% 8-Hydroxyquinoline can be used as an additional preservative; this also
> > turns the phenol layer yellow, making separation of phases easier.
> 
> But it's harder to tell when it's gone off  :)
 
When it goes off, it turns red, but again the transition point is
difficult to tell. If its red even with HQ, better discard it. 

Suresh
> 
> r
> 
> 

---