Light and colour theories and their relation to light and colour standardization (1915)
Lovibond, Joseph Williams, 1833-1918 · London, E. & F.N. Spon, limited; New York, Spon & Chamberlain · leaf 117
APPENDIX II 79 ink, the age of the writing, and the detection of forgeries. A full description of the process will be found in his work entitled Questioned Documents, published by the Lawyers’ Co-operative Society, Rochester, N.Y. The application to chemical analysis is too well known to require… … Fig. 9. Dyes. — As an example of the use of the system in the valuation of dyes, Fig. 9 illustrates the specific colour curves of four samples of Methylene Blue. No. 1 was priced at 5s. 9 d. and No. 2 at 5 s. per lb., Nos. 3 and 4 were not priced, the solutions were measured in percentages from…
Light · Color
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
