Hi guys, I have seen in my village that there is one guy who is heating up the stone slab for few mins with gas cylinder fire and after few mins. he pouring some liquid on that heated part. Immediately that part becomes break small pieces. He removes them and again heating up and pouring that liquid. Like this, he total breaks that stone slap and makes big hole. As a chemist student, i wanted to know what is that liquid. when i asked him, he simply smiles and not revealing me. I felt very bad that though i studied person, i could n't find out the liquid name as that person know. I think its available every where. i thought that its spirit, but its not when i checked its smell. he carrying in plastic bottle and it looks like water. but its not water. so what could be the liquid. any guesses here guys. Just out of interest, i am posting it here. Thanks to all.