Collecting blue dragon scales
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Blue dragon scales spawn in the Taverley Dungeon and the Taverley blue dragon resource dungeon, and they are currently worth 2,125 coins each. The better place to collect them is the resource dungeon as they're closer together and there are more of them, but that area requires 60 Dungeoneering to access. Without the resource dungeon, you can collect about 550 scales per hour, compared to 900 inside the resource dungeon. 70 Agility is also recommended to avoid having to traverse Taverley Dungeon, which would require a dusty key. A Beast of Burden like the spirit terrorbird, war tortoise, or pack yak are also very helpful to cut down on banking time.
Teleport to Taverley using the Taverley lodestone and head south to the dungeon entrance. Use Surge to travel faster. Enter the obstacle pipe if you have 70 Agility, or otherwise go the long way around (see Map:Taverley Dungeon for details). Enter the resource dungeon if you're able, and start collecting the dragon scales, being careful not to attack any blue dragons by accident. Pick up all of the scales (they respawn very quickly), storing them in your familiar as needed. Enabling area loot will allow you to pick up multiple scales quickly. When your inventory is full, teleport back to Taverley, bank the scales, and repeat. Grinding the scales is usually not worth the time taken and is not recommended, as the scale dust costs much less than the regular scales.
To avoid accidentally attacking blue dragons you can hide the option to attack. Do this by opening Settings > Gameplay Tab > Combat & Action Bar > 'Choose Option' Menu, then under the header NPC attack option use the pull-down menu to choose Hidden. While the attack option is hidden you'll be able to click through blue dragons to get the scales underneath them. This is especially helpful if you need to gather scales outside of the resource dungeon due to lack of access. Be aware this will hide your attack option on all NPC's, so be sure to change this back to the original setting of Combat Level instead of Hidden once you're done gathering the scales.