However, by the addition of a weak
solution of gum in alcohol or other suitable sizing to the composition,
it may be used with paints containing elements sensitive to sulphureted
hydrogen without danger of decomposing them and destroying their color.
In many, and possibly in a majority of cases, the illuminating
composition applied as a dry powder will give the most satisfactory
results, in view of the tendency to chemical action between the paint
and composition when intimately mixed; in view of the fact that by
the addition to paint of any color of a sufficient quantity of the
composition to render the product luminous, the original color of the
paint will be modified or destroyed; and, also, in view of the fact that
the illuminating composition is so greatly in excess of the paint, the
proportions in which they are united being substantially ten parts
of the former to one of the latter, it will be difficult to impart a
particular color to the product of the union without detracting from
its luminosity. On the other hand, the union of dry powder with a body
already painted by the simple force of adhesion does not establish
a sufficiently intimate relation between it and the paint to cause
chemical action, the application of a light coat of powder does not
materially change the color of the article to which it is applied; and,
further, by the use of the powder in an uncombined state its greatest
illuminating effects are obtained.
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