Before the collapsible metal tube, what specific organic container was typically used by artists to store their mixed oil paints?
Answer
Pig bladders
Prior to the innovation of the metal tube, artists relied on pig bladders to store their oil paints. These containers were fashioned from the internal organs of pigs and were inherently problematic for serious work. They were fragile, prone to leaks, and susceptible to punctures, which often led to the waste of expensive pigments. Furthermore, because they were difficult to seal effectively, the paint inside would frequently skin over and dry out if left unused for short periods, requiring the artist to either scrape off the wasted material or discard the contents entirely.

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