Well spotted Andrew, that silver stuff with adhesive back is the equivalent of the Reflectix stuff the yanks are putting on SCTs.
Alex is correct about the colour. I made a white coreflute dewcap and it stays dry while anything black is cold and dewy. Details
https://www.cloudynights.com/topic/6...tube-currents/
There really is a reason classic scopes have white tubes. Choosing dark colours was a dumb decision on the part of Meade/Celestron.