Colo. Rev. Stat. § 4-8-205
An unauthorized signature placed on a security certificate before or in the course of issue is ineffective, but the signature is effective in favor of a purchaser for value of the certificated security if the purchaser is without notice of the lack of authority and the signing has been done by:
Source: L. 96: Entire article R&RE, p. 218, § 2, effective July 1.
Editor's note: This section is similar to former § 4-8-205 as it existed prior to 1996.