elementaryOS 0.4.1, GTX 1080
Broken: 2.79.1, r5492d2c
Short description of error
A glass material with volume absoprtion shader plugged in creates colored caustics (with filter glossy at 1), even though the volume shader color is almost entirely white.
Exact steps for others to reproduce the error
I have a glass table with a volume absoprtion shader plugged in. The color is just slightly green. I noticed that when a lamp is shining through the glass that the caustics turn out entirely greenish. The effect is very noticable due to the filter glossy setting of 1. I found that weird, so I set the volume color back to white, and then set the red channel to 0.9999999999, so that even the node UI would show the red channel color as 1.0. So the color should be pretty much white now. Still, the caustics are the same color as before. In fact, it doesn't make a difference if the red channel is set to 0.0 or 0.9999, the caustics always have the same color.
Here's the file: