just a quick follow-up. I see now that attribute 420 is a color attribute, which is the reason for the value of FFFFFF, which would be 'white'. This attribute shows up in individual ENTITIES as well if one specifies a color. However, the problem is that first of all it leads to a file that is not viewable, and secondly it is redundant because the same color information is being stored in the attribute 62 as well. For example
red yields attribute 62 = 1, attribute 420 = FF0000
green yields attribute 62 = 3, attribute 420 = FF00
blue yields attribute 62 = 5, attribute 420 = FF
If I go through the dxf file and delete all references to attribute 420 then the file is viewable in Voloview and still has color associated with each entity.