Tan Leather is a Lunar spell which tans up to 5 hides in the player's inventory, with no extra gp cost like there would be with the normal process of tanning. However, in order to cast the spell, the player must have completed all of the easy, medium, and hard tasks of the Fremennik Diary.
With good timing, this spell tans around 8000 hides per hour, giving the player ~130K Magic experience per hour and can be used as a good method of money making.
|Hide||Hide cost||Leather price||Profit/Loss per hide||Tanner profit|
|Cowhide (Hard Leather)||116||136||-74||17|