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Instant
This term is strictly justified only in the cases of dry powders or mixes which rehydrate instantly, i.e. in a matter of a few seconds (e.g. instant coffee, instant tea) and should be reserved for such speedy action. By extension, however, the term has sometimes been misused by applying it to dry mix products which rehydrate faster than some others but still take a few minutes rather than a few seconds. For the latter, a term such as 'rapid' would be more appropriate.
Irradiated
Having been subjected to ionising radiation.
Isotonic
A term applied to a liquid product, e.g. a drink, having osmotic properties approximating to those of blood serum, i.e. 280 milli- osmoles per kg.
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