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.

As cowhide can be tanned into either soft leather or hard leather, it is possible to toggle between the two by right-clicking the spell icon.


Spell cost
5Fire rune1Nature rune2Astral rune600
Combo runes
1Nature rune2Astral rune5Lava rune595
1Nature rune2Astral rune5Smoke rune765
1Nature rune2Astral rune5Steam rune940
1Nature rune2Astral runeTome of fire575
1Nature rune2Astral runeLava battlestaff575
1Nature rune2Astral runeSteam battlestaff575
1Nature rune2Astral runeStaff of fire575
1Nature rune2Astral runeSmoke battlestaff575


The formula below, assumes you will be tanning 5 hides per spell, buying the dragonhides, nature rune, the astrals and will be casting the spell with a smoke/lava/fire/steam staff, or Tome of Fire

Hide Hide cost Leather price Profit/Loss per hide Tanner profit
Cowhide (Leather) 101 135 -81 33
Cowhide (Hard Leather) 101 142 -74 38
Green dragonhide 1,487 1,690 88 183
Blue dragonhide 1,861 2,059 83 178
Red dragonhide 2,337 2,518 66 161
Black dragonhide 2,917 3,109 77 172