Blue ones can be farmed, they got less chance to open a new slot. Also the chance of stacking the same enchantments is less than the red ones.
Red ones are able to buy w plat or buy them from the Auction, the red ones have more chance to open a slot and also more chance at stacking the same enchantment.
However there's a diff between red and blue, this doesn't mean they always open faster by red! It's random and looted by luck.
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