Care should be taken to differentiate between the natural corrosion of containers with subsequent loss of contents, and loss due to old or secondhand containers.
Some chemicals absorb moisture upon exposure to the atmosphere, when the substance is said to be deliquescent, and the phenomenon is known as deliquescence. Efflorescence is the converse phenomenon, when a substance evolves moisture upon exposure to the atmosphere and is said to be efflorescent. These phenomena require to be taken into consideration when shortage or excess weight out-turns cannot otherwise be explained. (See also under individual headings.) See also IMDG Code & US CFR.
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