RTape 4078 & 4050 - How to tell them apart?

[express2100 154]

I purchased a roll of each but they are not labeled. They appear to have the same tackiness and tensil strength. The only difference I can see is one is slightly yellowish. For all I know this could simply be due to how old it is or which lot it came from etc and these could both be the same tape.

Anyone have both who can tell them apart?

[Wildgoose 4,200]

Did you look inside the roll? Seems like they are marked inside. I am not around mine right now to be able to verify this.

[mr300s 1,272]

yes I know mine were marked inside even though I don't use it anymore

[express2100 154]

the cores are only labeled with Conform, address and phone #