What is the shelf life for Yellowing consumables?

Yellowing Papers Unopened packets have a shelf life of 2 years. Once opened, the papers can be used for 6 months providing that the packet has been kept sealed between tests.

Control Fabric

Unopened packets have a shelf life of 1 year.  

Once opened, the control fabric can be used for 6 months providing that the packet has been kept sealed between tests.

BHT-free Film

Unopened boxes kept sealed and in a dark place have a shelf life of 1 year.  

Once opened, the film has a shelf life of 1 year providing that the box has been kept closed and stored in the dark.

James Heal strongly recommends that consumables which have exceeded their shelf life should not be used and should be discarded.

Results obtained by using expired consumables cannot be considered valid.