Solution worded differently:
Colors that use the primary color red to make, vs colors that don’t/cannot
Reds and its secondary and tertiary relations vs. not
Red and its pigment relatives vs. not
Comment from the author (a.k.a. Morgan Kidd):
Thank you Sally D. for introducing me to bongards!
Adjacent-numbered pages: BP1285 BP1286 BP1287 BP1288 BP1289  * 
precise, notso, color
Morgan