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How can I know the concentration of my EDTA vial?

How can I know the concentration of my EDTA vial?

The EDTA vials with a clear cap are 0.5M EDTA (old concentration).

edta old

The EDTA vials with a blue cap are 0.25M EDTA (new concentration).

edta new

The new concentration is reflected in al batch numbers with the following format (or higher) NBD1424.20.0001 and NBD1424.20.0002. The old format was seen in the following format NBD1424.10.0001.

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