Under Colorado law, if you are conveying a property by deed it must be in writing, it must contain the words "sell" and "convey", it must include a legal description sufficient enough to identify the property, it must be signed by the grantor (seller) and delivered to the grantee (buyer). Once the deed has been signed and delivered, it should be recorded in the county where the property is situated.
Title can also be conveyed by means other than by deed, including by decree, bankruptcy, condemnation, and adverse possession.