C.R.S. § 12-120-216

(1) Upon receiving a license from the board, a professional engineer may obtain a crimp type seal, a rubber stamp type seal, or an electronic type seal of a design approved by the board. The seal must contain the licensed professional engineer’s name and license number and the designation “Colorado licensed professional engineer”. Colorado professional engineers licensed before July 1, 2004, may continue to use their prior existing seals. (2) A professional engineer shall use a seal and signature only when the work to which the seal is applied was prepared under the engineer’s responsible charge. (3) The board shall adopt rules governing use of the seal and the retention, use, and distribution of sealed documents and copies thereof.