Regum

Regumming is a process intended to defraud collectors.

First is the requirement to know what the gum on a specific issue is like: color, texture, finish and the like. Streaks on gum can be common even on some very modern issues so should not disqualify those stamps from being collected or not regarded as never hinged. Paranoid collectors will see regumming on anything offered to them usually without any kind of knowledge whatsoever. Don't be one.

Bad regumming jobs show as stamps with gum piled up on perfs, usually just on one or two sides. Gum on the inside of perf holes clearly comes from regumming. That said, there are some excellent regum jobs out there without any flaws to tip off non-experts. Wihtout bothering to handle a lot of stamps and developing the recognition skills, you rbest bet is to buy mint stamps of value from dealers that know their stuff. 

