Painting and Painters' Materials; A Book of Facts for Painters and Those Who Use or Deal in Paint Materials

Painting and Painters' Materials; A Book of Facts for Painters and Those Who Use or Deal in Paint Materials

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ...looking through them, you will have no difficulty in deciding which is the most opaque, and therefore will cover best, and is (probably) the purest lead. The sample which appears darkest and shuts off most light has the greatest covering capacity. Chandler's Test.--Use 100 grains of white lead ground in oil, % grain lamp black (best), 4 drops of boiled oil. Mix thoroughly on a glass plate with a steel knife, and you will have the materials for a "quantitative" test: ' Paint the mixture on a surface, the resulting color tests the purity of the lead. White lead With barytes mixed as above. in oil. Color produced. 100 grains and O grains Light drab. 95 "" 5 Slightly darker drab. 90 " " 10 66%" " 33&" 50 " " 50" 00 lamp black gr. 100" Black. "On trial, six different persons agreed separately to the differences in color as given above." (Prof. C. F. Chandler). If zinc white be in the lead, the color produced by the mixture will tend to bluish drab in proportion to the amount of zinc; 6 or 7 per cent. of zinc is sufficient to give a decidedly bluish tint. On the other hand, mixture with barytes gave a pure drab, darker in proportion as adulterated with barytes. The practical painter will have no difficulty in applying this test with sufficient accuracy, if he will weigh out in ordinary scales, say 100 ounces (6i lbs.) of each sample to be compared, adding to each half an ounce of dry lamp black, and to each sample an equal quantity of boiled linseed oil. After mixing the lead, black and oil together, very thoroughly, spread each sample on glass, wood, or other smooth surface as nearly alike as possible, when the difference in depth of color produced by the black more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • United States
  • English
  • black & white illustrations
  • 1236891201
  • 9781236891204