Scientific American 26, 24.12.1859
Messrs. Editors: - In No. 23, of the present vollume of Scientific American, is an article bearing the above caption; and I think the phenomena may be readily accounted for. The oil which had been used in the painting of the houses was probably rancid; and having an affinity for the carbonic acid in the atmosphere generated from decaying vegetable matter, resulting freom the destruction at this time of year, of foliage &c. From the rapid corrosion is this case by oxygen in the oil assisted by carbonic acid, it is not to be wondered at that the paint changed to the seer and yellow ray. The drabs or neutrals are especially subject to weather stains.
The rain storm from north-east, which again changed the color held in solution chloride of sodium, from oceanic evaporation, necessarily re-bleached the paint.
New York, Dec. 19, 1959,
E. F. B.
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