I had a black Franke composite sink put in about a month ago and I’ve done the most stupidest thing yesterday. I boiled the kettle and put a pan on the sink sideboard, was shouted for in the other room and left the pan on the sink 🤦♀️. I didn’t think much of it when I came back and carried on but now I have a big greyish circle on what was my perfect black sink. I’ve just read the product details again and it says that the sink is “Scratch resistant, stain resistant, UV resistant, temperature resistant to 280°C”. I don’t know how to fix it or am I just going to have to live with it now? Anyone able to give any ideas on how I could fix this please?