Tuesday is dedicated to Lord Ganesha, Hanuman, Goddess Durga and Kali.
Most of the devotees visit Devi and Hanuman shrines. Those people who fast on Tuesday avoid taking food containing salt at night. Fasting on the day is dedicated to Hanuman and Mangal or Mars.
Mangalwar, Tuesday, takes its name from the god Mangal or Mars who rules the day and is considered to be a trouble maker, and the fast is to ward off the harmful effects.
Red is the preferred color on the day. It must be noted here that the Hanuman might not be worshipped on Tuesday in all regions.
Some communities might be worshipping some other deity. For example, in South India the day is dedicated to Skanda or Muruga or Kartikeya (Kartik). But generally Tuesday is dedicated to Hanuman.