Hmm... Well I heard that SoE was having problems with the cleaning contractors in the tradeskill instances since LUD25 due to the increased crafting activity.. Resulting in not being able to dispose of all this "dust" in an enviromentaly friendly way! Roumor has it that they are employing the scout type NPC's to "sneek" this dust into the bags of budding artisans in the hope that it will be put to good use and possibly disposed of properly... The general merchant in all zones will be selling dustpans and brushes for 5plat next LUD....
In short I dunno lol, Maybe its just dandruff ?? hehe