Ulfar is described as a combination of blue and yellow which is not green, but rather retains both ‘yellowness’ and ‘blueness’.
Jale is similarly said to be a combination of red and green which retains both redness and greenness rather than mixing into brown.
Ulfar in which blue predominates is sometimes said to be a separate colour, dolm.
It seems likely to me that ulfar and jale are, respectively, the ‘blue-yellow’ and ‘red-green’ which in our world were discovered by Hewitt Crane and his colleague Thomas Piantanida in 1983, and are only viewable under artificial conditions.
“Ulfire.”
I deliberately spelled it differently, because ‘ulfire’ reminds me of ‘fire’ and implies that fire should be that color.