A Química das Tatuagens


Uploaded by quimicadascoisas on 12.03.2012

Transcript:
THE CHEMISTRY OF THINGS
Some like them, some hate them
but few ignore them.
They are a form of individual statement
and their popularity has grown in recent years.
Today in the Chemistry of Things we talk about...
...tattoos!
Known for over 5000 years, tattoos have evolved over time
and are now beginning to take a decisive step towards change
thanks to the development of chemistry!
With new removable inks, tattoos lose their most distinctive feature:
they will no longer be a commitment for life.
Tattoo inks are usually obtained suspending a dye in a suitable liquid:
alcohol, water, glycerin or a mixture of these.
The dyes vary greatly in their composition
and the most used ones are relatively harmless.
Black inks are usually carbon oxides,
blue inks are obtained with copper salts or cobalt oxides.
White may be titanium dioxide, zinc oxide or lead carbonate.
These compounds are stable under the skin and the tattoo is permanent.
Removable inks follow a completely different philosophy:
they are based on dyes that can be absorbed and degraded by the body.
The absorbable dye is wrapped in a transparent capsule
that ensures it remains in the skin
for as long as the owner of the tattoo so wishes.
How? The protective capsule is made of a light-sensitive material,
which decomposes when irradiated with an appropriate laser.
This way, when the happy owner of this tattoo decides to remove it
he or she simply needs to use a suitable laser to degrade the protective capsule,
releasing the dye molecules.
These are then absorbed and metabolized by the body
and within hours the tattoo disappears without a trace!
An important development for those who prefer
what is volatile and temporary...
To know more about the chemistry of tattoos
visit our website quimicadascoisas.org
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