Hi Tom,
Awhile back I made some that was much darker too, it washed fine and 
everything but I didn't trust it. I followed JtF test for excess 
glycerin by re treating a liter like virgin oil.  It had 0 glycerin fall 
out and I have confidence that it is good Bio. Just has Dark straw color.

Luck
Jim

Thomas Kelly wrote:

> Hello To All,
>      I get very dark WVO from a Chinese restaurant. I tested a sample 
> and found virtually no water. It titrated at 1.3g/L. Usually my WVO 
> gets mixed together, but I ran a 20gal. batch using only this oil. It 
> washed (stir-washed) very easily. The finished BD was clear down to 
> below 40F, but was very dark. I reprocessed a .5L sample  ----> NO 
> glycerine dropped out. A 25ml. sample dissolved completely in 225ml 
> methanol. It appeared to be very high quality BD. I've been running it 
> in my car and I responded to a question by Danislov K. regarding dark 
> BD. I told him that if it passed these quality tests it should be OK 
> to use.
>    BUT: In going back over the Quality Tests described at JtF .....  
> #    Alex Kac wrote: Deeper color biodiesel has a lot of glycerine in it 
> in the form of various glycerids. Not good for standard engines. 
> Remedy: If the diesel is too dark and you are sure that you used the 
> correct quantitie(s) of catalyst(s), add a pinch more alcohol -- you 
> could be losing it due to evaporation."
>  
>      - Did I give Danislov the wrong advice???
>     - If glycerine "in the form of various glycerids" was present in 
> the finished BD wouldn't it show up upon reprocessing?
>     - Is it possible to have high quality BD that is very dark in color?
>                                           Tom
>     
>  
>  
>    
>
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