Oil turning dark in oven

So im new to the oil game but I have a mk3 from terp extracts. The past 2 runs I've made super gold/yellow bho at the end of the run but then i put it in the oven an it turns dark. I started it at 85 and raised it 5 degrees an hr until the muffin fell at 110. Should I colapse the muffin at 85 and just purge at lower temp? But I was told that auto budder it and im going for shatter. Anyways, any thoughts or opinions would help. Its fresh greenhouse trim that I dewax with dry ice. The recovery tank stays in ice and the pot doesn't go above 90 in its water. Maybe my slabs are too thick? But why be yellow while it's in there at its thickest and turn,dark in the pour?

For lightest color, I don't set a Mk III in water and let it run at freezing, except to periodically dip the recovery tank in <85F water to remove the ice, so as to be able to see where it reforms. When you reach -22" Hg and it doesn't reform, you know the puddle is gone.

I suggest that you start at 115F in your oven and increment up your vacuum, instead of the heat. Raise the vacuum until it boils rapidly and hold it at that vacuum level until it subsides, before raising it until it does again. When you reach -29.5" hg and the boiling has subsided, flip it and start over.

Pull out as much butane as possible at low vacuum, before high vacuum, where you are also boiling away monoterpenes.

As far as color, anthro cyanins exhibit the Beers/Lambert effect, so that thick films are orders of magnitude darker than thin films.

If you are expanding the raw oleoresin into cotton candy in the Mk III, you have essentially expanded and dried it as foam, so it is paper thin and will be many times lighter than when in a slab.

Which brings us to slab thickness. The thicker the slab, the longer it takes to purge under vacuum, and the more monoterpenes you lose in the process.

In addition, pharmer Joe, our biotech, opines that we get further darkening by caramelizing plant sugars with heat, which would also be affected by time at temperature.

Aside from the current public love affair with super blonde product, and the implications if you are extracting for that market, I might suggest examining your reasoning for caring about the color as much as odor, flavor, effect.

In general, clear trichome extracts are lighter than cloudy trichome extracts, which are lighter than amber trichome extractions, and different strains produce different hues. Lighter may be an indicator of headier young material, but is only part of the color spectum present.

Darkening may serve as an indicator that plant sugars been caramelized, suggesting time at temperature and ergo, a general reduction of the lighter monoterpenes, but if that is so, it will more reliably show up in the sniff and taste test.