It's one of those questions we must get 10 times a day:
"My tobacco has gone dry can I just add water?" "How do you keep additive free Tobacco moist" "What's the best way to store my tobacco to stop it drying out" "Even in the tin my tobacco goes dry there must be a way to keep it moist"
Finally solutions are starting to emerge on the UK market. Basically soak the Mascotte Hydro stone in clean water for a few minutes. This allows the porous terracotta to absorb moisture then place in your tobacco pouch/container. The cold damp stone will keep the tobacco fresh without over soaking the tobacco.
The stone should keep even additive free tobacco's fresh for weeks or even months in a sealed container. In a pouch that is regularly opened we would recommend re-soaking the stone every couple of days.