Does it take 5 Romeo & Juliet scripts?

You can affect the finishing product with the ingot of a respective color (Copper to red, silver to white/silver, gold to gold). Though I never heard of using multiple script to raise the percentage. Sounds wasteful. but The minimum amount of scripts is 4 should you make a success on each one, then one last final script to finish the shield.

With the best success rate with production parties, Monday bonus, rain casting, and blacksmith enhancements, you will use up 5 (4 for smithing, 1 for finishing). In short:

(Number of tries x 1 R&J Script) + 1 R&J Script = Total number of scripts

This counting if you fail, and whether or not you waste scripts while not getting the best success rates. Took me 5 tries cause I failed (with 89% success o.e). and then another one for finishing. I didn't use an ingot since i wanted to see the outcome. It was...rather lucky it came out blue and grey.