He lays great stress on boiled oil
holding water in suspense to cause blistering, which is merely a
conjecture. Water boils at 212 deg. F. and linseed oil at 600 deg. F.,
consequently no water can possibly remain after boiling, and a drop of
water put into boiling oil would cause an explosion too dangerous to
be encountered.
It will be shown herewith that boiled oil, though in general use, is
unfit for durable painting, that it is the cause of most of the
troubles painters have to contend with, and that raw linseed oil
seasoned by age is the only source to bind pigments for durable
painting; but how to procure it is another trouble to overcome, as all
our American raw linseed oil has been heated by the manufacturers, to
qualify it for quick drying and an early market, thereby impairing its
quality. After linseed oil has been boiled, it becomes a poor varnish;
it remains soft and pliable when used in paint, giving way to air
pressure from the wood in hot weather, forming blisters. Turpentine
causes no blistering; it evaporates upon being exposed, and leaves the
paint in a porous condition for the gas in the wood to escape; but all
painters agree that blistering is caused by gas, and on investigation
we find two main sources from which gas is generated to blister
paint--one from the wood, the other from the ingredients of the paint.
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