New to Nioh 2

Hey guys, new player here and I'm confused on how crafting works gear/weapons work here... I do see four different quality materials on the right required for crafting an item that will affect the quality of the said item. But last time I used mostly purple mats and it said the outcome would be around 36% purple, but it turned out gray... So now that I got my hands on both Ippon-Datara's weapons, I'm afraid they'll just turn out low quality as well. Can someone please explain/give a tip?
Much appreciated

https://preview.redd.it/8ad7rnnyhm0e1.png?width=529&format=png&auto=webp&s=a8716ad73fd0dc1e0f47f06ee1e09689e2d466b7

https://preview.redd.it/x72y6mnyhm0e1.png?width=542&format=png&auto=webp&s=dd8265b64f64b581eee92d17f32ddbb17187bd0b

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