“Again, another assumption. Because a portion of the long-form is lifted up by the edge of the envelope you assume that the paper is different from the that of the receipt. That’s not something you can establish from that photograph.”
Sure it is. I’ve been a graphic designer for 12 years. I can tell that the BC is on nothing more than a 60# sheet and the receipt is on nothing less than a 80# sheet.
I can tell like that. *snaps her fingers* Thanks to the table underneath. It’s what I do.
Apparently not well.
The only pictures in which the long-form paper appears lighter weight than the receipt are the ones in which the envelope is lifting up the edge of the paper. You can't "see the table" in any of the other pictures. The paper appears to be the same weight in the other pictures.
Again, speculation.