Thanks Geoff
never used it, don't come across it very often
Found
To make something appear more valuable by adding or applying something to it in a fraudulent or deceptive manner.
Aha! Thanks Don

funny you should describe it like that, recently I have "watched"
eBay and "old collections" in old Albums.
The prices they are fetching is extraordinary,
I see most fairly common stamps with an occasional seeming scarcity or weird cinderellas "to salt" as you say the collection.
I put an estimate of $45 on 1 album, and had in excess of 40 bids
knocking down in the $300's