It is used during the Tattoo making process to smoothen the skin and it holds the excess ink spilling too much making it easier to see & follow what you are doing. 
Vaseline Petroleum Jelly Original with triple-purified Petroleum Jelly protects dry, cracked skin and locks in moisture to keep it healthy.
Vaseline Petroleum Jelly is clinically proven to help heal dry or damaged skin.
Petroleum Jelly is hypoallergenic, dermatologically tested and non-comedogenic, so it will not clog your pores.