Identifying Plumber's Putty Stains

What happens here

The presenter shows a close-up of a stained quartz countertop around a faucet hole. He explains that the discoloration is caused by regular plumber's putty leaching oil into the porous quartz surface. He also points out an existing gasket on the faucet, indicating that in some installations, plumber's putty may not even be necessary as the gasket provides the seal. He emphasizes that if the faucet had remained longer, the stain would have spread further.

Goal: Visually understand the staining issue caused by incorrect putty use.