Papers on paint and varnish and the materials used in their manufacture (1920)
Gardner, Henry A. (Henry Alfred), 1882- · Washington, D. C. · leaf 355
ned under the paper cones, except that the etiolation was more rapid in the case of the purple blue. One plant showing yellow leaves was restored to normal condition by removing it from the box and placing it near a quartz tube mercury light sending forth strongly actinic rays. While the… … FIG. 44 Tomato Plant Exposed to Influence of (Left) Blue (Right) Red Paint and Glass. 352
Paint · Varnish and varnishing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.