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4The coat of Punic wax prevents the effect of the moon’s as well as that of the sun’s rays thereon which injure and destroy the colours in work of this nature. The laboratories which were formerly carried on at the mines in Ephesus are now transferred to Rome, on account of mines of the same sort having been discovered in some parts of Spain, whence the clods are brought and worked by manufacturers at Rome. These laboratories are situated between the temples of Flora and Quirinus.
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