. Textile school catalog, 1916-1917 . rtunity of doing considerable practical dye-house work. 89 COURSE IN CHEMISTRY. DYEING AND PRINTING DYEINQ 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 becomes familiar with the mixingqualities of dj^estuffs, and obtains a good idea of just how tosynthesize a c
. Textile school catalog, 1916-1917 . rtunity of doing considerable practical dye-house work. 89 COURSE IN CHEMISTRY. DYEING AND PRINTING DYEINQ 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 becomes familiar with the mixingqualities of dj^estuffs, and obtains a good idea of just how tosynthesize a compound shade by the use of a few dyestuffs. Thevalue 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. And hereinafterthroughout the dyeing course he is constantly called upon to matchcolors to be dved on large lots of LECTURE ROOM -CHB:MISTRy AND DYEING. DYEINQ 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.—Use of the chromatic circle in the comparison and compounding ofdifferent dyes.—The spectroscope; its construction and use; its application tothe study of color in dyeing and in dyestuffs.—The tintometer and its use.—Dichroism in dyes; methods of determining the same by the spectroscope andtiiitoiTieter.—Effect of dichroism in compounding dyes and in color matching.—Effect of character of surface on colors of dyed goods.—Effect of artificiallight on colors.—Study of primary, secondary and tertiary colors; tints,shades and tones of colors. The laboratory is equipped with a number of the very best formsof spectroscopes, together with a Lovibund tintometer especiallydesigned for textile work. The spectra of a
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