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Test kits

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They really do - in the newer ones it is printed on the front of the bottles, but the older bottles have a lot number telling you the date of manufacture..... You should be able to see it - the last 4 digits of the "lot number" are the month and year of production i.e. 22a1107 is a bottle produced in November 2007. Copper and phosphate last up to 3 years.... so in the example the expiry would be 2010. Can you tell me what the lot number is? Otherwise maybe just post a clear image of the front of the bottles?

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