blue distillate blues
- the blue distillate problem is not caused by alkalinity in the wash
per se, but by free ammonia liberated from ammonia salts (eg DAP)
under alkaline (or even neutral) conditions. The product usually
smells clearly of ammonia, too.
If the first distillation is done under acid conditions, and no
ammonia salts are in the wash, there is no ammonia to liberate.
I have personally only seen blue product when running the original
wash that had been neutralized. I have never neutralized the bicarb
in the strippate, and have never seen any blue tinge nor smelled any
ammonia in the product from these runs.
However, if there is some source of ammonia salts in the boiler or in
the strippate (well water in agricultural areas, residual first wash
in the boiler, etc.), you might easily get the same result as Harry.