its not outlawed as far as i know and can still be bought readily from most surpliers, the non galvinization of the tube is only for asthetics and to stop the steel from rusting, the actual differerance of load properties betwen black and galvi tube are very slight but the price is only pennies apart, so its much better in the long run to get galvi - but black has its uses for handrails and treepro, a SSO should only condem it when used in a load bearing scaffold if its heavily pitted due to rust or badly flaky , but just paint it and use for tree protection