[Greenbuilding] slate treatment

[Speireag Alden]

Sgrìobh Mary Bull - Greenwood Earth Alliance:

>Linseed oil sounds natural, but they add toxic heavy metals to make it hard,
>I am told by our natural builder.

     You have to specify the stuff without the heavy metals added. 
It's out there, and costs more.  You're right to be wary of general 
linseed oils, which contain lead, among other things.

-Speireag.

-- 
Anger, if not restrained, is frequently more hurtful to us than the 
injury that provokes it.
--Lucius Annaeus Seneca, philosopher (BCE 3-65 CE)