Taarak Mehta Ka Ooltah Chashmah S01 E2419 Jethalal In Trouble

"Problems Toh Hain Sabke Saath, Bas Nazariye Ki Hain Baat!"

Jethalal presumes Iyer to be Sunder, since Iyer is wearing Sunder's cap. He applies permanent color on Iyer's face, making Iyer furious. Iyer discovers that the color is not washing away with water. What happens now?