Question

why (pan leaves) only cover by red cloths??

Answer 1

The Paanwala covers the Paan with red clothes has the following reasons:

1.  Paan (Betel) has chemicals which react with Lime (Chuna) and Catechu (Kattha) to produce red color; so inorder to prevent the clothes of other color being tanned with red color of betel lime and catechu that falls at regular intervels by the hands of paanwala on paan, red color cloth is used so that color is not noticed and he is saved from headache of washing the cloth regularly.

2.  Moist cloth helps in keeping paan fresh.