[Cob] RE: masonry heaters and pigment in plasters

[Mary Lou McFarland]

I REALLY like the links Amanda sent for the MHA.  The small heater section 
clarified the process for me , except where to put the damper.  Any 
suggestions?  I was also wondering..where do you buy firebrick?  The only 
source that I know of is a kiln manufacturing outlet (mail order) for people 
re-building their kilns.
Also, being an old hand at coloring easter eggs, I know you set your colors 
with vinegar.  Has anybody tried mixing their pigments with vinegar before 
adding to the plaster mix?  I would think that it would offset the 
characteristics of the lime a little bit anyway.