theories  that different people have had aobut this type of foam:

some kinds of oils make biodiesel that makes foam during washing

a lot of air being entrained in the biodiesel can form this sort of 
foam (I haven't seen this personally)

several different factors about the water could prevent emulsion as 
well- but in some circumstances, you might still see odd effects such 
as foam: 

using hot water prevents emulsion
hot temperatures outside will also inhibit it
acidic water prevents emulsion
minerals in the water inhibit emulsion but also inhibit washing out of 
soap


--- In biofuel@yahoogroups.com, "jayantharangaonkar" 
<[EMAIL PROTECTED]> wrote:
> Dear all,
> I have recently joined this group.
> I have made the biodiesel, but during washing lot of foam formation 
> has occoured but no oil water emulsion has formed. I want to know 
> what can be the reasons & what actions to be taken.
> 
> Regards,
> 
> Jayant




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