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Composition Chemical Analysis Has Shown Several Of The Blues To Be








oxide of copper with a small proportion of iron; none containing cobalt.
There is little doubt, however, that the most brilliant specimens--those
which retain all their original force and beauty in the temples of Upper
Egypt after an exposure of three thousand years, consist of
ultramarine--the celebrated Armenian blue, possibly, of the ancients.





Next: The Reds Seem For The Most Part To Be Composed Of Oxide Of Iron Mixed




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