In this attached image is the render of the plane with the tex/trans shader. This plane has shadows turned off, and is about 5 inches in front of a green plane that is 150% larger. As you can see, with or without "light through transparency" in the renderer (ray tracer), the transparent areas of the smaler plane tend to multiply (lighten) the color of the green plane behind it. The result is much worse if shadows are turned on, or if the transparency map is darkened. Changing the ambient from 0 doesn't seem to matter much, nor do variations in backface settings nor variations in reflection, glow or refraction settings. My question is: what settings do I use to avoid the lightening of whatever is behind the transparency?