I'm not clear on how the Concealment power affects astral forms and signatures. Can it be used to hide them? The rules state that "perceiving magic" is a Perception Test (core, pg 280), but Assensing Tests don't use Perception (core, pg 312), which is what the Concealment power statistically affects. (Improved) Invisibility specifies that it doesn't do this, but Concealment does not.
Mostly, I ask because I want to determine the practicality of having a spirit use Concealment to hide a character's astral form/signatures from other Awakened (and it's own), rather than learning Masking and/or Extended Masking.