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21U

21U is a specialized form of ultramarine pigment that is known for its vivid blue coloration and unique chemical composition. It is derived from mineral sources, primarily involving the use of synthetic or naturally occurring ultramarine compounds. The term "21U" is often used in industrial and artistic contexts to denote a particular grade or formulation of ultramarine pigment, distinguished by its purity, stability, and intensity.

This pigment has been historically valued for its favorable stability to light and chemical exposure, making

21U is recognized for its environmentally friendly attributes, as it does not contain toxic heavy metals commonly

In applications, 21U is often selected for its high tinting strength, excellent colorfastness, and ease of dispersion.

Overall, 21U exemplifies a modern, versatile ultramarine pigment valued for its aesthetic qualities and environmental safety,

it
suitable
for
use
in
artworks,
coatings,
plastics,
and
cosmetics.
Its
color
is
attributed
to
the
presence
of
sulfur
within
a
complex
aluminosilicate
matrix,
which
produces
a
vibrant,
opaque
blue
hue.
The
manufacturing
process
typically
involves
aluminate
and
silicate
components,
combined
with
sulfur
compounds,
and
subjected
to
high-temperature
firing
to
produce
the
characteristic
pigment.
found
in
some
other
blue
pigments,
such
as
cobalt
or
cobalt-based
compounds.
Its
stability
and
non-toxicity
have
contributed
to
its
popularity
in
sustainable
manufacturing
practices.
It
remains
resistant
to
fading
over
time,
maintaining
its
vibrancy
across
different
mediums
and
conditions.
As
a
result,
it
is
frequently
used
in
both
artistic
and
industrial
production
where
durable
and
vibrant
color
is
essential.
representing
advances
in
pigment
chemistry
and
sustainable
material
use.