on pts i took my main (covenant) and ripped through three places i knew were populated by red rook bandits. in doing so i only found 1 recipe. i found too few backpacks or desks/trunks. two other backpacks i found alchemy water.
believe me we will still need alchemy water. but given the absolute rarity of desks/trunks, why are we still getting bone/molydenum/et al? those are easily bought for 15g?
it isnt a good idea at all to change the color of recipes. therefore i suggest you add them to the loot drop of just one other type of container. specifically, any container that is a "named" container like "melon crate" or "seasoning sack". those are spread out just right in dungeons that the random chance at a green should give a solid chance at one recipe per dungeon run.
apud me omnia fiunt Mathematicè in Natura - Rene Descartes