- Original Message -
From: girl mark <[EMAIL PROTECTED]>
> I'm actually more worried about soaps than about residual catalyst, as
it's
> easier to wash out the catalyst, I think, than the soaps. I'm doing pH
> testing partly to figure out when to stop washing, as well as for the
> initia
Just add a few drops of the phenolphthalein that you use in
your original oil titration to a few ml of your biodiesel.
Warning -- either soap or alkali will turn it pink, since pure
soap is itself alkaline. I don't know exactly the pH at which
the pink happens, perhaps some chemist here knows the
>Hi folks,
>
>Poking around on the internet this morning (good day for that, I'm way,
>way sick with some superflu after talking biodiesel at people for 16 hours
>at the Biodiesel Intensive Workshop last weekend). I found a little bit
>more testing info that seems somehow relevant.
>Suppos
