The expert house painter; by Kelly A. Ashmun (Albanis Ashmun) 1849-1928

Author:Kelly, A. Ashmun (Albanis Ashmun), 1849-1928
Language: eng
Format: epub, pdf
Tags: House painting. [from old catalog]
Publisher: Malvern, Pa., Press of the Master painter publishing co.
Published: 1913-03-25T05:00:00+00:00

A good quality of linseed oil, raw, will gain from 16 to 17^2 per cent, in weight in drying, and boiled oil, say from 15 to 17 per cent. An oil containing benzine or turpentine will show a decided loss during the first hours of drying and some of the cheap oils used in paint will show an ultimate loss in weight, instead of gain. With a chemist's balance at hand the quality of the oil may be ascertained by mixing it with an excess of an inert substance say silica or barytes, and then weighing the mass from time to time, as it dries.

Substitutes for boiled linseed oil are, as a rule, mixtures of rosin, linseed oil, more or less, crushers' driers, and some thin oil, mineral most likely. Many of these substitutes contain rosin or rosin oil, benzine and kerosene oil. If the painter will use an adulterated oil it would be money in his pocket to make it himself, then throw it away and use as good and pure linseed oil as money can buy. The use of adulterated oil cannot be defended upon any rational grounds, and the man who uses it injures his patrons and himself. It is dishonest.

A very simple and effective way for testing linseed oil suspected of containing petroleum oil is to fill a bottle about one-third full of the oil, then almost fill with a strong solution of salsoda or potash. Shake well, when the mineral oil will separate from the linseed oil, the latter forming with the lye a soap. The mineral oil will not saponify, but remains unchanged.

To test an oil for rosin, take equal volumes of the oil and grain alcohol and mix them well by shaking in a test tube or long bottle. Let stand for one hour, then pour the alcoholic layer into another clean test tube or bottle. Into this alcoholic solution let fall two to five drops of solution of sugar of lead (lead

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.