Rawhide is essentially the base product for parchment (not really, mostly kids’ skin is used for the real stuff - as in baby boy goats and sheep), but as Luke has had to leap thru loops (sanding and whatever) to get to the point where the stuff looked like parchment, he might as well haver used parchment.
But — I do like to follow Luke’s reports about his progress on the road to {…}, so please discount these remarks if necessary for your inner state of zen.
BTW The effect of parchment is as what is shown here with the heavily processed rawhide. {Just saying!}