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This article has a money making guide here: Humidifying clay.
Please add tips to the subpage, rather than the article below.

The humidify spell will fill all empty water-carrying vessels in a player's inventory with a single cast including: buckets, fishbowls, jugs, vials, watering cans, unwatered saplings, waterskins, bowls, and clay. Somewhat surprisingly, it does not work on Empty cups. It yields 65 experience per cast regardless of the number of vessels filled. It can also be used to extinguish the wall of flames in the Chambers of Xeric when fighting Great Olm or to refill waterskins in the Kharidian Desert instead of needing to cut cacti.

A steam battlestaff, or staff of water and tome of fire can be used for maximum efficiency. It can be used to train Magic while making profit from some of the items above:

Input Output Profit
Bowl.png Bowl Bowl of water.png Bowl of water 20
Bucket.png Bucket Bucket of water.png Bucket of water 24
Clay.png Clay Soft clay.png Soft clay 29
Jug.png Jug Jug of water.png Jug of water 24
Vial.png Vial Vial of water.png Vial of water 0
Waterskin(0).png Waterskin(0) Waterskin(4).png Waterskin(4) 35

To maximise experience per hour with this spell, put a fishbowl underneath the spell (similar to High Level Alchemy) and to the "F1" and "F6" keys (or custom F-keys) to switch between spellbook and inventory. Left-click empties the fishbowl. Casting High Level Alchemy is always cheaper when alchemising profitable items while this method always results in loss. Upon hearing the sound effect, all vessels have been filled.

Cost[edit | edit source]

Spell cost
1Astral rune.png1Fire rune.png3Water rune.png178
Combo runes
1Astral rune.png1Fire rune.png3Mud rune.png730
1Astral rune.png3Water rune.png1Lava rune.png177
1Astral rune.png3Water rune.png1Smoke rune.png233
1Astral rune.png3Steam rune.png338
1Astral rune.png1Fire rune.png3Mist rune.png580
1Astral rune.png1Fire rune.pngStaff of water.pngAlt163
1Astral rune.png3Water rune.pngStaff of fire.pngAlt173
1Astral rune.pngSteam battlestaff.png158
Main and off-hands
1Astral rune.png3Water rune.pngTome of fire.png173
1Astral rune.pngStaff of water.pngAltTome of fire.png158

Update history[edit | edit source]

Date Changes
30 October 2014
(update | poll)

The Lunar spell Humidify will now work on saplings held in your inventory.

15 August 2013
(update | poll)

The 'Humidify' spell can now be used to soften clay.

22 February 2013

This content was included when the Old School RuneScape servers officially launched.