The filter color, also known as the translucency color, is the color transmitted through transparent or semi-transparent materials such as glass.
Using a Filter Color map
You can use a bitmap file or procedural map to control the filter color component. This map applies a transparent-color effect based on the intensity of the map's pixels.
3ds Max opens the Material/Map Browser.
(If you choose Bitmap as the map type, 3ds Max opens a file dialog that lets you choose the image file.)
Alternatively, you can use the Slate Material Editor to wire a map node to the Filter Color (or Translucency) component.