Silk will stretch the same percentage of its length regardless of its thickness. The only difference thickness will have is how much force it will take to stretch it to the point of rupture. The percentage of stretch that silk will tolerate before rupture is far less than sinew. The paint bit is for lack of a better word, just silly. I don't see where it would have any thing to do with comparing sinew to silk and how far they stretch. Unless I completely missed your point, which I hope is the case. BTW...I don't see anything that I would consider offensive Doobs. Josh