But this protean plastic takes innumerable
forms and almost as many names. Each factory has its own secrets and
lays claim to peculiar merits. The fundamental product itself is not
patented, so trade names are copyrighted to protect the product. I have
already mentioned three, "parkesine," "xylonite" and "celluloid," and I
may add, without exhausting the list of species belonging to this genus,
"viscoloid," "lithoxyl," "fiberloid," "coraline," "eburite,"
"pulveroid," "ivorine," "pergamoid," "duroid," "ivortus," "crystalloid,"
"transparene," "litnoid," "petroid," "pasbosene," "cellonite" and
"pyralin."
Celluloid can be given any color or colors by mixing in aniline dyes or
metallic pigments. The color may be confined to the surface or to the
interior or pervade the whole. If the nitrated tissue paper is bleached
the celluloid is transparent or colorless. In that case it is necessary
to add an antacid such as urea to prevent its getting yellow or opaque.
To make it opaque and less inflammable oxides or chlorides of zinc,
aluminum, magnesium, etc.
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