Cob: Lime wash

[Carl Bauer]

I have been experimenting with oxide pigmented lime washes and have read 
that dark colours with a lime wash don't work. I tried stabilising my lime 
wash with a bit of cement (about 4 lime to 1 cement) and then adding the 
oxide. It seems to work as the cement itself darkens the wash anyway. In 
fact it makes a much less see through mix so I guess it won't need as many 
coats either. I also mixed a little bit of linseed oil in for water 
resistance on the external walls. Has anyone tried anything along these 
lines and has anyone got any good advice?

On the internal walls I want to use a plain or lightly pigmented lime wash. 
I have done a sample and it is a bit dusty (like a poor quality undercoat). 
Any way of improving this? I am using powdered lime as it is the only form 
of lime available to me here.

Carl Bauer