. Textile school catalog, 1917-1918. student has the opportunity of doing considerable practical dye-house work. 89 COURSE IN CHEMISTRY, DYEING AND PRINTING DYEING IV. Principles of Shade Compounding and Matching Primary, secondary and tertiary colors.—Preparation of tints of singledyes.—Compounding of two dyes in different percentages.—Preparation ofcolors containing three dyestuffs.—[Matching of samples on wool; on cotton.—Matching colors from one class of fabrics to another. In this course the student hecomes famihar with the mixingqualities of dyestuffs and obtains a good idea of just how
. Textile school catalog, 1917-1918. student has the opportunity of doing considerable practical dye-house work. 89 COURSE IN CHEMISTRY, DYEING AND PRINTING DYEING IV. Principles of Shade Compounding and Matching Primary, secondary and tertiary colors.—Preparation of tints of singledyes.—Compounding of two dyes in different percentages.—Preparation ofcolors containing three dyestuffs.—[Matching of samples on wool; on cotton.—Matching colors from one class of fabrics to another. In this course the student hecomes famihar with the mixingqualities of dyestuffs and obtains a good idea of just how tosynthesize a compound shade by the use of a few dyestuffs. Thevakie of shade matching is early impressed on the student and, asaptitude and accuracy in this can only be acquired by practice, eachstudent is required to match a large number of shades on differentclasses of goods and with different classes of dyes. Throughout thedyeing course he is constantly called upon to match colors to bedyed on large lots of LECTURE KOO-M . DYEING. DYEING V. Color Mixing and Spectroscopy Study of the phenomena of light and the nature and cause of color.—Nature of color in dyestuffs and pigments.—Color absorption in the mixingof dyes.—The spectroscope; its construction and use; its application tothe study of color in dyeing and in dyestufls.—The tintometer and its use.—Dichroism in dyes.—Effect of dichroism in compounding dyes and in colormatching.—Effect of character of surface on colors of dyed goods.—Effect ofartiticial light on colors. The laboratory is equipped with the very best forms of spectro-scopes, together with a Lovibund tintometer especially designed fortextile work. The spectra of a number of representative dyes areplotted by the student, and the mixing qualities of the dyes are90 COURSE IN CHEMISTRY, DYEING AND PRINTING deduced tlierefrom: and this scientific work is supplemented bypractical dye tests in the lahoratorx. T
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