from Hacker News

The Colors of Chemistry

by EvanMiller on 6/9/14, 7:54 PM with 14 comments

• by StefanKarpinski on 6/9/14, 9:24 PM

  Even if you don't follow the first half, it's worth skimming to get to the bottom where the computations predict the colors of chemical compounds with remarkable accuracy. The "Copper (II) aqua ion" one is the most impressive to me – the entire color spectrum is spot on.

• by jwmerrill on 6/9/14, 10:44 PM

  What's going on with Rhodamine B? Its color doesn't change as a function of concentration? Why does its transmittance data seem to bounce back and forth between 0 and 1?

• by gourneau on 6/9/14, 11:04 PM

  Dang, I want those interactive plots with IPython notebooks

• by anarchoni on 6/10/14, 2:13 PM

  C.R.E.A.M. - CIE Rules Everything Around Me

  So many factors go into color matching and this is just the tip of the iceberg. Pigments vs dyes, solutions vs solid substrates, angles, light sources, observers...etc. Color is subjective, so creating an objective color-output that matches an average person's perceptual color vision is one hell of a fascinating, and expensive puzzle.

• by throwwit on 6/10/14, 12:22 AM

  Are Google analytics usually in Julia notebooks?

• by cpa on 6/10/14, 1:01 AM

      λ->planck(λ*nm,T=T)*m^3/Watt*cie_color_match(λ)
  

  This syntax made me cringe hard. Kids these days…