Does anyone know if the neon block-out tubing referenced on pg 43 of NT&H is still made? It is also implied that the process is chemical--does anyone have any insight as to what sort of chemical reaction would bring out the lead in sign tubing? Imagine dipping a tube in such a solution instead of paint... Probably would have been thought of by now if it were possible, but it doesn't hur to ask! Thanks, Garett Churchill Garett@adnc.com