Liquefied petroleum gas containing more than five percent liquid volume butane or butylenes shall be designated as butane-propane mixtures and shall be sold for use only in those applications approved by the director of the division of oil and public safety and for which special use permits have been granted.
Source: L. 73: p. 1069, § 9. C.R.S. 1963: § 100-5-14. L. 2001: Entire section amended, p. 1122, § 31, effective June 5.