Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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To Prepare Aldehyde
Aldehyde is made by filling a tubulated glass retort, altogether to one-third full, with 32 parts, absolute alcohol, 30 parts bichromate of potassa, and, without previous cooling, a mixture of 35 parts oil of vitriol, and 30 of water, in small portions, through a safety-tube in the tubus.
After one-half of the latter has been introduced, the mixture commences to boil and aldehyde begins to distill over, the remainder of the said mixture being added through the tubulus as required. No further purification is needed.