CLEAN : Tutankhamun mask: damages are reversible

The video discusses two main statements regarding the mask: there is no current danger to it, and the measures taken are reversible. An incident occurred last year when the mask's beard fell apart due to glue used in a 1944 restoration. The type of epoxy resin used is unknown, but it is a common solution when other methods fail. The glue can be reversed, though it requires careful handling.

What can be said about the measurement done on the glue at the beard?

What is mentioned about the reversibility of the glue operation?