This urn-shaped blown-glass jar has rounded shoulders and a flared neck with a round glass stopper in its mouth. The opaqueness of the glass comes from the addition of tin oxide in an attempt to mimic porcelain. The jar has a gold shield decorated with red and blue flowers, with a label inside the shield that reads ALUM UST in black. This jar would have contained Alumen ustum, or heated alumen. Alumen ustum was chiefly used as a caustic for irritating the skin.
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