Article/carrier mixtures expiration dates

A reasonable interpretation of 58.113(c) should not require expiration dating of containers of article/carrier mixtures when the mixtures wiU be used on the date of preparation unless a component of the mixture has an extremely short (e.g., less than 8 hr) period of stability. This section does not require that an expiration date appear on feeders that are filled with article/ diet mixtures on the date the mixture is prepared and are presented to the test animals on that same day. 

Do any of the components of the test and control article carrier mixture has an expiration date Is that date clearly shown on the container ... 

Third, for each substance (or article) that is mixed with a carrier (solvent or other medium) 1) the uniformity or concentration shall be determined, 2) the solubility shall be determined (EPA only), and 3) the stability in the mixture shall be determined. Expiration dates shall be clearly shown and (EPA only) the device used to formulate the mixture shall not interfere with the integrity of the test. 

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