See Additional information under Ketchup
See also: Catsup Bottles Trivia; Catsup Quotes
The first record of the word in English was as 'catchup' in 1690; in 1711 the spelling 'ketchup' appeared, and finally in 1730 the spelling 'catsup' appeared. This was all before the advent of 'tomato ketchup' sometime near the end of the 18th century.
Tomato Catsup has a high acid content (due to both the tomatoes and vinegar in it) and therefore does not have to be refrigerated after opening. It is safe to store it at room temperature, but it will taste better if kept refrigerated.
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