So here it is: the first attempt at determining the temperature at which the pigment produced by Chlorociboria vanishes.
This is preliminary data (you never stress it enough!), furthermore testing will be needed to assess the exact way it happens within a seriously controlled setup.
The pigment is stable up to 90°C, then it quickly starts to degrade. At around 110°C, half the pigment has lost its color. At 125°C, only 25% of the coloring remains. At 155°C, only 10% of the green is still present.
Please note that the subsequent coloration of the wood due to closed-vase combustion has not been taken into account here, and the temperature growth rate was rather quick (1°C/s) mainly because I used a propane torch (at a distance) to gently heat the test tube, and I didn’t want to kill the whole gas bottle.
All in all, xylindein is stable up to 90°C, and quickly loses its color between 95-125°C.
Which would mean that, with my experimental setup, water steam would destroy the color of my wood samples.
Which ultimately means that it might not be a good idea to try to hot-bend or steam-bend xylindein-stained banding for, say, binding a box or a guitar body.
I guess you guys now understand why I was so anxious about getting that information ;)
-- Pondering the inclusion of woodworking into physics and chemistry classes...