A study of optically active dyes, mechanism of dyeing and absorption spectra
A 1926 chemistry dissertation by Wallace R. Brode, published in Easton, Pennsylvania, on optically active dyes, dyeing mechanisms and absorption spectra. Its single picture is a plain black-line graph on a cream grid, with curves plunging and crossing and one labelled 'Excess Acid', a clean scientific diagram a designer could borrow for technical layouts, data motifs or grid-based backgrounds.
