Hi Ken - pretty amazing, I'd definitely be in the only ever seen it is faint green category, but then I'd never really looked for any pink either. S'pect it would depend a lot on how dark it is and how dark adapted your eyes are (and maybe on how old your eyes are
). I guess there's no reason why some people might have more or more effective "Cones" (the colour seeing bits in the eye's retina) than usual or at least a higher number in relation to their more light sensitive B&W "Rods". After all it's a deficiency in one or more of the RGB "cone" receptors that cause colour blindness - perhaps some can be more colour sensitive than others.
cheers,