PETG Black 3D Printer Filament 1.75mm 1kg/roll

Hello, I bought this black PETG 4x, 3 rolls were glossy. When during printing the third roll was empty, I changed to the fourth. Now the new roll suddenly has a matte color without changing any settings (it was in the middle of printing with a Prusa MK3S+ and a 0.5 CHT nozzle, 217 degrees C). I was lucky it was only a cup holder and you only saw the top finished side (matte side). The quality and the print image has not changed. It was very good as with all the other rolls. I must also really otherwise praise the quality very much, I can switch between the individual colors at PETG (black, white, blue, green, red, orange, gray) back and forth and always have good to very good results without having to change settings in the slicer, so the quality always remains within a very small tolerance. I buy my filaments only here, because the price is cheap and the print quality always remains the same.