For an alternative method, see Tanning blue dragonhide at the tanner.
|-428,000 per hour|
5,000 x Blue dragon leather (15,420,000)
Blue dragon leather is used to train Crafting, and it is always in high demand. Because Blue dragonhide must be tanned into leather before it can be crafted, tanning the hides in bulk can be highly profitable.
While regular tanning can be quite profitable on its own, using the lunar spell Make Leather (which tans five hides at once) can increase the profit by more than 50% while also giving decent Magic experience. The downside is that Make Leather must be unlocked from Livid Farm, which requires 489,200 produce points.
Because the price difference between hides and leather can be fairly small, it is important to buy the hides for a low price and sell the leather for a high price; you can lose out on up to 50% of the profit if you are not patient. Test the profit by buying one Blue dragonhide and one Blue dragon leather. If the difference between the two is less than 200, it may be worth it to switch to a different hide type. In some cases the profit can be more than 500 coins -- the guide prices on the Grand Exchange are not always indicative of the current trading price.
Begin by equipping your staff of fire and withdrawing body runes and astral runes, along with 25 blue dragonhides. Click the Make Leather spell (either in the spellbook or directly on your action bar) and use it on one of the hides. A Make-X interface will pop up. Tan all of them (five at a time, so five total casts), and then bank your blue dragon leather and repeat. If you are fast with banking, you can do 200 loads per hour, and 1000 total casts.
When finished, sell the leather on the Grand Exchange. Since the margin can be rather high, consider buying one blue dragon leather first and selling your for one coin below that. This can save you more than 100 coins per item.
It is strongly recommended to check the live prices on the Grand Exchange before making large investments in any method.
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