Blue h'ween masks are a discontinued holiday item dropped on 31 October2002. Their price is between that of red and greenhalloween masks. However, in the early years of masks, in RuneScape Classic, they were the most expensive H'ween Mask. If a player died before the 19th April 2011 update wearing or having any discontinued item in their inventory, it will most likely be lost if a player has 3-4 items worth more than 7 coins. However, since this update players can select which 3 or 4 items they wish to keep. It may be traded in the Grand Exchange. Much like the Santa hat, the price of this rare item is generally rising steeply as players quit, get banned or occasionally die and lose them, thus reducing the number of the rare items in the game.
After the update on 9 June2010, all H'ween masks turned red for a short time, regardless of their colour. This was fixed by another update several hours later. This also occurred to other items such as rune full helms which looked like zamorak full helms.
When the item is equipped, it shows darkness where the eyes are, but the chathead shows the eyes clearly, possibly because before the graphical update for player's eyes, they were black, and chatheads were normal eyes, the H'ween mask's eyes most likely are clear.
The 'Classic' version of the Blue h'ween mask was worn flat on the face, similar to how a black mask is worn.
The mask appears slightly differently on males and females - the forehead is accentuated with female characters and the horns curve differently compared to the mask worn by males.