How to farm key molds?

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I have been killing crimson mobs in the crimson for a while, now, and I still have not had a key mold drop.
Is there an easier way to farm key molds?
I want them so that I can get the vampire knives.
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What is the easiest way to get biome keys?
Events are one of the best ways to farm Biome Keys and their Molds. An extremely large amount of Enemies spawn during events, and many of them will have a chance of dropping a Biome Key or Mold, supposing that you are in the appropriate biome in which one can drop.How do you get key molds?
In order to make a Key Mould, first make a Wad of Putty. Then knock out the desired guard, open his inventory, and remove the key. Craft the key together with the wad of putty to make a key Mould of the color key. Then open the guard's inventory up again and replace the original key.How do you make a key farm?
Just like other molds, the Crimson Key Mold can drop before killing Plantera. This mold can be farmed by killing the creepers from The Brain of Cthulhu. In mobile version, you can reuse the Bloody Spine item by simply tap on it and quickly tap on another item in your hot bar.Terraria 1.2: How to get Key Molds! (UPDATED AFK FARM GUIDE) @demizegg
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