Brie
Brie is the best gold purchased cheese available (save the ones sometimes available from Ronza). It is used for hunting in the higher areas. Hunters almost always use this cheese in the Training Grounds if they don't want to pay for SUPER|Brie+. It is also frequently used in the lab due to it's pungent smell.
Brie can be converted into Radioactive Blue using a Radioactive Blue Cheese Curd Potion or Greater Radioactive Blue Cheese Curd Potion.
To convert Brie it costs 300 gold per piece in conversion costs and 200 gold per piece for the cheese itself. This amounts to a total cost of 500 gold per piece for conversion.
Many people prefer to convert Brie due to the much cheaper price. However the amount of Brie a hunter can convert with a single potion is a fraction of what can be converted using SUPER|Brie+, so it is up to hunters to decide how much their time is worth.