i recall saying something like that on a thread, i was speculating that, since Sweat of brow icon's BG color is purple the ability's element is lightning( and its stat could be dex; Dex element is lightning). it was all speculation, since in FFXI some WS had a blue icon meaning they were water based, Stacking Mind would increase the benefits of such WS.

but i was speculating this.

and moon cycle and element of the hour do affect the outcome on crafting, havent tried naked tho...