Is it a given that Lichen will just dry out ? I have some older Lichen that was stored in a bag, it was faded, but not totally dried out. I put in a tupperware bin, added a little bit of water and it softened up quite nicely. I used some cheap green watered down tempera paint which brought it back to a nice green color. I glued some onto my layout about 10 days ago and it has already dried out. I live in Western Colorado so our climate is quite dry here. I have the old book "Scenery for Model Railroads" by Bill McClanahan, ( great book ) He talks about using Glycerine. Will Glycerine keep it soft ? or will it just dry out again.