The mineral and metallic
fibers are essentially undyeable, and special techniques must be used to impart
color to the fibers. Thermally stable ceramic pigments can be added
to molten glass prior to fiber formation, or pigment-binder systems may be
appl ied to the surface of the mineral and metallic fibers. Glass fibers
can also be sized with a protein which then can be insolubilized and dyed
with conventional protein dyes. Glass fibers
are colored by coronizing,
which involves preheating of the glass substrate to high temperatures to
remove all organic materials followed by coloration with a pigment-binder system.
The metallic fibers may also be colored through anodizing the metal
(often aluminum) filament present or through pigmentation of the plastic
layer coating the metal. The nature of the metal in the organometallic
fibers determines their ultimate color.
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