Rationale

Ballot Number: D27 (22-03) No statement of expiration time for Platinum-Cobalt color standards is listed in the method. For example, Lovibond recommends the samples be stored at 4C for no more than 24 hours, and warmed before use. Even Millipore Aldrich puts an expiration date on their stock reference solution. What is known about the stability of the standard should be referenced in the standard if it has a negative impact on the measurement.