okay, my current stock is garvey, nero and violet flowpen (out of marsh).. some of you swear by adding things to garvey, but i have always liked it alone.. however i have enough garvey now, that i can afford to screw some up.. using any of these, which ones would you mix to make something that stains plastic better than garvey does.. I have never used flowpen ink before, but i did get a free bottle not long ago, so i could try to use that some how.. any advice would be appreciated...