The factory mask is a reward from the Flash Powder Factory minigame and is part of the factory outfit. It can be bought from Brian O'Richard for 2,000 Brian points or from Stanley Limelight for 225 thaler. While equipped, it improves luck while searching fallen rubble in the factory – it reduces the chance of failing to find an item in fallen rubble by 15%, assigning that 15% to other outcomes.
The entire outfit confers a major bonus to Herblore; wearing three out of the five factory items will give a chance of creating 4-dose potions instead of 3-dose, and while wearing all five of the pieces, creating unfinished potions will give the same amount of experience as cleaning the relevant herb.
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- ^ Mod Moltare. "Game Update FAQ - 13/12/11." 2011-12-14. RuneScape Forums. "The helmet reduces the chance of finding nothing in rubble by 15%, spreading that 15% around the other outcomes"