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What is an Ultramarine?
Ultramarine
Blue (sodium alumino-sulphosilicate) was
first manufactured in the 1800s and though
claimed to be all natural by some, is the
manufactured form of naturally occurring
Lapis Lazuli. Its approximate chemical formula
is Na8-10Al6Si6O24S2-4
A.
"Artificial ultramarine, also
known as French ultramarine was made by
heating, in a closed-fire clay furnace,
a finely ground mixture of China clay,
soda ash, coal or wood, charcoal, silica
and sulfur. The mixture was maintained
at red heat for one hour and then allowed
to cool. It was then washed to remove excess
sodium sulfate, dried and ground until the
proper degree of fineness was obtained."
B. "The color additive ultramarine
blue is a blue pigment obtained by calcining
a mixture of kaolin, sulfur, sodium carbonate
and carbon at temperatures above 700 [deg]C."
The material obtained from this process
is crushed, washed, purified, and ground.
C.
"Natural Ultramarine is
famous for having been the most expensive
pigment. It was more expensive than gold
during the Renaissance. First used in 6th
century Afghanistan, the pigment found its
most extensive use in 14th and 15th century
illuminated manuscripts and Italian panel
paintings, often reserved for the cloaks
of Christ and the Virgin."
D.
"Ultramarine is a blue pigment, consisting
essentially of a double silicate of aluminum
and sodium with some sulfides or sulfates,
and occurring in nature as a proximate component
of lapis lazuli.
Q:
I have read that Ultramarine Blue is also
called sodium alumino-sulphosilicate - I
see alumino in the name and am worried about
aluminum - is Ultramarine a form of Aluminum?
No
it is not. Ultramarine is an inorganic pigment
like mica and iron oxides we use. When we
look at the elements that make it what it
is, we see the following app. formula for
Ultramarine Na8-10Al6Si6O24S2-4
A
good example is Mica,
formula KAl2(AlSi3O10)(F,OH)2 that
is used in mineral makeup -- "mica
is an abundant silicate mineral that contains
potassium and aluminum and has a layered
atomic structure." Again, we see Al
in the elemental structure of Mica, but
Mica, just like Ultramarine Blue is not
a form of Aluminum.
E.
Aluminum Chemical symbol Al - Metallic
chemical element, chemical symbol Al, atomic
number 13. "The metallic element aluminum
is the third most plentiful element in the
earth's crust, comprising 8% of the planet's
soil and rocks (oxygen and silicon make
up 47% and 28%, respectively). In nature,
aluminum is found only in chemical compounds
with other elements such as sulphur, silicon,
and oxygen. Pure, metallic aluminum can
be economically produced only from aluminum
oxide ore."
Aluminum
chlorohydrate, formula AlnCl(3n-m)(OH)m
is a group of salts. The commonly used form
in deodorants and antiperspirants is Aluminum
chloride hydroxide with the formula of Al2Cl(OH)5
When
seeking the truth, we all have to gather
as much information as possible and absorb
all valid data. Once we are fully armed
with logical data, the haze will dissipate
leaving the unadulterated truth behind.
Knowledge
is power and this power needs to be bundled
with responsibility.
Keep
your questions and suggestions coming --
we will continue learning and growing together.
Be
well,
Sevi
P.S:
Got any useful info you like us to post
about Ultramarines or minerals we mentioned
here in general - feel free to e-mail us
at cs@sevicosmetics.com - subject: ultramarines
A.
History of Ultramarine, Copyright webexhibits.org
B. Ultramarine in Foods, Copyright FDA.GOV
C. History of Ultramarine, Copyright webexhibits.org
D. Ultramarine Blue, Wikipedia
E. Aluminum, Enotes
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