Answer to Question #73778 in Chemistry for Kfalah

Question

Hi. A friend of mine who thinks that she is under influence of black magic, meet a astrologer. the astrologer asked her to wear a t-shirt for 3 nights and then bring that to him. The astrologer cut some lemons and rubbed throughout the t-shirt. Then he used some water on her hands and face and asked her to keep the t_ shirt on her palm. Anyway, after about 15 minutes the shirt catch fire and the astrologer drop rest of water to put the fire down. I'm now wondering what chemical can cause this fire. I also been told that water was looks muddy. Would you please help me to find out what material potentially used by astrologer. Also I'm suspicious about acid in the lemons and water which has been used, as well as body fat or sweat perhaps was on the t_shirt too. She was telling me that at the first smoke color was white but it turns to black after T_shirt catch fire. The smell of fire was so bad like a rotten meat. Would you please help me to find out the truth. Thanks