Yeah, if I recall correctly, it was mentioned in the corroboration between a few SCP's. Wander around a bit amongst the pages mentioned here:
Document 028/005/150/040/151: Agent ███████ was exposed to SCP-028, but displayed no effects. Two days later Agent ███████ acquired SCP-005 and used it to acquire SCP-150, then made his way to SCP-040's chamber. Upon Agent ███████'s entering the chamber, SCP-040 reacted, and Agent ███████ was transformed into [DATA EXPUNGED]. Agent ███████ (now classified as SCP-151) left SCP-005 and SCP-150 in SCP-040's chamber and proceeded to leave the compound. Though not met with violence from SCP-151, all attempts at containment failed. Whereabouts of SCP-151 are currently unknown. SCP-151 constitutes a significant risk to both the secrecy and the containment of all other SCPs. It is recommended that it be apprehended/terminated at all costs.
It's in there somewhere, I just can't recall where.
EDIT #1: Found SCP-777, still searching for mention of your idea. I know I've seen it somewhere…