5 × Quartz Enriched Iron + Enchanted Book + 2 × Bookshelf + Upgrade → Silk Touch Upgrade
The book must carry the enchantment shown (Silk Touch, or Fortune at exactly that level).
No recipe of Refined Storage 2.0.9 uses Silk Touch Upgrade.
Textures, models and item names © raoulvdberge and the Refined Storage contributors.
Recipes, names and numbers are read from the mod files of Refined Storage 2.0.9 for Minecraft 1.21.1 (NeoForge). Not affiliated with the mod authors, Mojang or Microsoft.