When I was a kid in school we had poster paint - I think it is also called tempera paint maybe. Large cardboard containers like oastmeal comes in fil of powder you mix with water. Then we painted whatever.
But I recall one thing wwe sometimes did, always on maps it seems. We called them "salt maps" because of this. You painted an area on your map, then poured plain old table salt over the fresh paint. Not only did it stick, but if it was good and wet, the paint would absorb up into the salt. Leave it to dry them blow away the excess later.
This resulted in a hard cake of colored salt. It had a sort of rough matte texture to it as you'd imagine and it took the color well. SO the map had a sort of 3-D quality to it.
HAs anyone else heard of this?
Oh duh!
I just googled salt map... I guess they are alive and well
http://www.richland.k12.wi.us/RES/Doudn ... 20Maps.htm
Though these are a bit different.