Twenty-five years ago a house needed to be painted outside but once in
from five to seven years; it looked well all the time, as no dust
settled in the paint to make it unsightly. Painters then used the
Dutch-process-made white-lead, a base and raw linseed oil, a fat acid,
which formed the insoluble soap. They also put turpentine in the
following coats, to keep up the proportions of oil and pigment. All
held out well against wind and weather. Now they use the
wet-process-made white lead, neutralized by vinegar, with oil
neutralized by boiling, from the first to the last coat, and--fail in
making their work permanent.
W.S., in the _Building News_, relates an unaccountable mysterious
blistering in a leaky house, where the rainwater came from above on a
painted wood wall, blistering the paint in streaks and filled at the
lower ends with water, which no doubt was caused by the water soaking
the wood at the upper ends where there was no paint, and following it
down through the fibers, pushed and peeled off the soft, inadhesive
paint.
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