While it is quite simple to perfect the Seven Metals, other materials are more difficult using Hone the Perfected Form. This is represented by requiring Reach to do them. But it is a gradient where some are easier than others where they reflect Supernal truths in a more direct manner than others.
Sanctum Bindings (• to •••)
Benefit: For each dot, one released spell is stable and doesn't risk paradox for its duration as long as its direct effects do not leave the area of the Sanctum. Once leaving though, the countdown begins and will not stop, even if the spell's effects once again are limited to only the Sanctum. Generally, this is used with imbued items to have less worry about their effects going awry.