Not sure who you think these people are who can't tell the difference. You? Or non chippers? As someone who spent my first two years here collecting inexpensive china clay and cards mold chips, once I decided to take the plunge into real compressed clay, the difference in feel was pretty obvious. I've always been pretty budget minded, so my first clay chips were non leaded RHC, then a few THC. Trying to assemble a mixed THC set, I ended up with some that were leaded, and others that were not. I absolutely did not like the differences. I'm now selling almost all my non leaded THC chips. And I'm definitely still a n00b chipper.