DYEING PROCESS OF EXTRACTING OR PURIFYING OF NATURAL DYE:
(under the class definition) Processes directed to the extraction of coloring matter from natural materials or subsequent treatment to purify the same so as to put it in a form suitable for use as a dye.
SEE OR SEARCH THIS CLASS, SUBCLASS:
645, for inorganic dye composition.
646, for natural dyes and processes of dyeing therewith.
SEE OR SEARCH CLASS
23, Chemistry: Physical Processes,
293+, for physical processes included therein for the treatment of inorganic compounds and nonmetallic elements.
260, Chemistry of Carbon Compounds, for the extraction and purification of carbon compounds classifiable therein. 423, Chemistry of Inorganic Compounds, appropriate subclasses for processes and purification of inorganic compounds and nonmetallic elements by chemical reaction and for processes of extracting, leaching, or dissolving inorganic compounds and nonmetallic elements.
