Please do not change the Level Requirement for this item to 19 (you cannot even buy or harvest gold till level 26), you cannot make this item till level 31, you may be able to buy the recipe earlier (I know I did) but it is at confirmed level 31 on the paradise support site/FAQ and several players- including myself.
It wasn't for my game (and others have reported) I had gold and the recipe unlocked and it remained grayed out till level 31, I couldn't even buy it for other peoples markets. In fact I couldn't even view it grayed- the recipe (it was invisible for my smith) though I bought it (I bought it at level 24 or 26), till like level 28 or 29- just to see it grayed out and the hover over said available at level 31.
Mind you, I played after that major update late July/early August, if you were playing before that update I can see it being the way you described.
In fact I have conflicted reports on an article you changed Sail, one source says Sail was 4 Pearls you edited it to 1. I personally don't remember I went from a list created by other users  and your edit conflicts so I am waiting for another confirmation in case it changed during an update.
Powder Keg price, it changed (you updated it correctly) I think it was last update but it was 174/303/606 to 718/1256/1689. I wish the game provided notes of their changes on an update. Cause if things permanently change in game and we all level at different times we might have editing wars on what we think it correct information LOL.
I'll try to be better at leaving notes or citation if I change something that is contrary to what someone edits (sometimes I forget and go auto pilot), if you can do the same so we can at least know there is conflicting info and may need a third confirmation.