Dry baccy help?

[physiognomy]

If my open tins get a little dry I fold up a piece of kitchen paper, moisten with a few drops of distilled water and place it in the tin. I make sure to remove it the following day & shake the tin to spread around the moister tobacco from the surface. I have never had a mould problem doing this, but I'm sure it could become an issue if the moist paper wasn't removed.