Thanks for that, Chris. I will observe the results of future crosses to see how it goes and then we will know more.
Some hybrid hibiscus seedlings have red leaves to start with but none has continued with them to maturity. The best I am growing right now is Hibiscus tiliaceous which has variegated leaves that become more intensely red the brighter and hotter it is.
http://www.hiddenvalleynaturearts.com/acatalog/htiliaceus.htmI've grown the H acetosella you show and thought it might become a commercial plant but it was too vigorous and too soft for shipping so didn't go forward with it. Might be worth trying again, and shipping while small in 4 inch pots.
charlie