Cleansing the Signature
System
Prime 4 can “cleanse” a Resonance signature, “wiping it clean” by one dot for every success rolled with the caster’s Arete. Should Kyle decide to use Prime 4 to clean out his signature, he’ll need to roll at least four successes. Cleansing Resonance is a coincidental Effect for Faint to Noticeable Resonance, and vulgar for Strong or Overwhelming Resonance. A successful roll wipes out all traces of that signature, regardless of the caster’s Prime Sphere Rank.
For obvious reasons, spies and Nephandi avoid using Prime magick, especially in places where people who know them might notice it, unless they have the power to clean up their mess afterwards.
For more information about Prime-intensive magicks, see the Energy-Work section in How Do You DO That?, pp. 42-51.