here is a 4X gray tint i found. Click Here (http://www.studiodepot.com/store/index.cgi?cmd=view_item&parent=1012-1087&id=6968)
It is used as a spray on Neutral Density filter. I have never used this product. Any ND filters I use are gel sheets or screw on filters. You might search photographic web sites for something. ND filters won't effect color only light density.
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