Best craft for blue and red scrips?

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Blue turn-ins vary significantly more often than Reds do. When I did them as an example, Titanium Alembic, was on special turn-in. I made several of them but could not turn them all in before the window ended. I held on to the others "until the next time". I held those Alembics for 4 weeks and never once did Titanium Alembic return as Blue script turn-in. Eventually, I had to just let them hit the floor.

More generally speaking though, Blues are going to be about level 56-58 mats; Titanium, Hardsilver, Dragon Skin, Dark Chestnut, some Adamantite.
IMO, Hallowed anything, is just not worth the effort.

effort... or price. worth neither. Seriously, 3k per mistletoe from NPC? And it's unspoiled so it's annoying enough to make you buy it.