Me mum sent me this last week: Mark A Hollands, Boris T Gänsicke, Pier-Emmanuel Tremblay, Detlev Koester "Any colour you like: the diverse chromaticities of white dwarfs". This alludes to, and reverses, the famous Model T quote: most of these stars-in-retirement are white, median #F9F5FF to be precise. That would correspond to 6504 K / D65 white point.
That #FF is indeed in the B part of RGB, but they deem the blue negligible, correcting most textbooks. I take it that the blue stars are simply the brighter ones we've historically seen from further away.
Most white dwarf stars fall on a boring logarithmic-like curve by temperature, as one might expect. Sabine is saying our own Sun would be on the green side but all that yellow-to-red swamps it out.
However: outliers exist. These are metal-polluted. I don't find overlap between the two papers. Something like 080843.15 + 464028.64 should be WD J0808+4640, la?
Which is a pity. The "metals" here seem to skew toward lithium and stellar gas, not rocky planet mantles.
WD J1330+6435 is the one making the news at #DDFFB8. That #FF is in the G part of RGB. When I was a kid I asked my dad if green was possible in stars and he said that some elements look green in a fire.
Since then, uh. The Starflight game had some green stars but, by that age, I knew better. There was also Alastair Reynolds with his "green-fly" Dyson swarm, turning some stars green. Mind, both were main-sequence.
So, at last, this paper illustrates what my dad was trying to say, with an example he didn't have on-hand, because none of us did. (Green stars'd make more sense in the Starflight sequel which happens where the solar flares already happened.)
Other outliers are such as might look blue but are cooler than 6000 K. WD J2356–2054 in Draco shines only 4000 K. Here is strong Na[trium] (sodium) pollution.