I'm trying to engrave the POWMIA insignia on acrylic But I'm having a real hard time getting the white to black and vice versa.The head and tower need to be black .Any help or advice would be appreciated. I would ask in corel forum but i don't know how to add a file there plus i don't think they have a lot of engravers that understand how engraving works . Thanks for any helpPOWMIA.cdr