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.
Home › Miscellaneous Chemicals › Urea
Urea
A crystalline , colorless, lighter petroleum oils. This may be ob- transparent substance, consisting of cyanate viated, according to Bremer, by distillation of ammonia. Fresh urine, gently evaporated over tannin. Articles treated with oil of to the consistence of a syrup, is to be treated turpentine that has been distilled in this with its own volume of nitric acid at 24 deg.; way, are heated to 150° Fahr., when they the mixture is to be shaken and immersed in lose every trace of odor. Bremer adds that this preparation is less inflammable, cheaper, and more agreeable to the workman than benzine. an ice-bath to solidify the crystals of nitrate of urea; these are washed with ice-cold water, drained, and pressed between sheets of blotting paper. When they are thus separated from foreign matters, they are to be dis-