[Histonet] shelf life

[Bitting, Angela K.]

We are being inspected soon and I'm trying to check the labels on all of my chemicals.  How do I determine the expiration date of a 1N HCl solution I prepared in house.  I went on line and a commercially available 1N HCl solution has a 36 month shelf life according to the vendor's web site. I don't know how they arrived at that. I know concentrated HCl has an indefinite shelf life, but a 5 year retest date appears on the COA. It's confusing to me.
Any help would be appreciated.



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