I thought that after a binge the body would be trying to get rid of some of the binge as waste matter.
But there are so many variables, you can't tell. What level was the glycogen at the time? How lean the person is, what their body. What %age were the macronutrients ate, how speedy was the persons digestion that day...or even hours and hours after.
Much depends.
Calories do hit the bloodstream pretty damn quick though.
And if you binged on fat alone (which would be impossible), as fat is ketogenic, theoretically, the stix will remain pink assuming nothing mixed with it from before and it was trying to get rid of excess quick
If you ate masses of protein, the stix might remain beige, as protein is partially antiketogenix.
Sorry, no clear answer, but I do think the websites you have been reading might have oversimplified things.