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It can be beetles that come off a cactus,
it can be the dried urine of a cow,
little insects that grow on an oak tree,
a chunk of lead that's soaked in vinegar.
It's truly amazing.
We're in Harvard University,
outside the Forbes pigment collection.
Pigment is a very small particle of colored material
that is mixed in with a binding medium.
The pigment gives paint its color.
The Forbes pigment collection has been
brought together over several decades.
We have around 2,500 pigments.
We have a lot of very unusual and very rare colors.
So this is, I think, one of the more unusually named pigments.
It's called dragon's blood.
It doesn't come from dragons, it comes from rattan palms.
And it give a very bright red pigment.
The unusual aspect of mummy has to do
with its source rather than the color itself,
and that comes from Egyptian mummies.
And it's the resin that's applied
to the outside of the bandages.
I think the rarest color that we have
is actually an entire ball of Indian yellow.
And this is a pigment that is made
from the dried urine of cows
that are fed only on mango leaves.
If you're looking at a work of art,
and you want to understand what is original
and what's a restoration, you will take
a tiny sample of pigment and analyze it.
A lot of the pigments are actually toxic,
so you don't want to handle the pigments
and then go out to lunch.
There's a green called emerald green
that has an arsenic center to it.
We can use them for telling if something is real or not.
People will say this is by a certain artist,
and we can look at the materials that are used
and decide if those materials were available
during that artist's lifetime.
If not, then we have to look at
who might have painted that picture.
I can't pick a personal favorite.
There's, it's like asking to pick a favorite child.
No, the other 2,400 would feel left out.
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VocabularyGuardian of the World's Rarest Colors
The materials collection at the Harvard Art Museums in Cambridge houses thousands of pigments, including some of the world’s rarest like dragon's blood, mummy, Indian yellow.
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