Guild Wars 2

I’ve only got a few items left in my weaponsmithing discovery panel, one of them being the destroyer lodestones needed to make Primordus weapons. I’d like to clear the panel out, but I have no interest in crafting 72 of these weapons to do so. Am I correct in assuming each prefix for each weapon must be discovered individually to clear the lodestones from the discovery panel?

Discovery: http://wiki.guildwars2.com/wiki/Crafting#Discovery

The discovery tab allows you to attempt to mix and match components to find a new recipe. Drag and drop or double-click items to add (or remove) them from the mix. When using the discovery pane, you only see items which fulfill all of the following criteria:

The item is in your inventory or your bank/collections tab.
The item is part of an undiscovered recipe.
Items are highlighted in red when they are part of a valid recipe that require a higher crafting level to discover.

I would say, yes. If you have any that needs to be discovered then the item will be in the discovery tab. If it was no longer in the discovery panel, how would someone craft ones with a new, undiscovered, insignia?