Laser on MDF is good,Paper notting

Hello
He lasers fine on MDF.
But on Photo paper, or just printer paper or Cardstock paper, it does nothing.
Is there a solution for that ??
2.5 Watt laser
GRBL-M3, GRBL 0,9J
bord Makerbase MK5 DLC v2.0

Better focus, lower speed, or higher power. With a visible light laser, any white material is reflecting most of the light, so it will not burn as well as something that is a little darker.

Hello
At 30% speed he does some, but not completely, at 35% speed he burns through paper.
At lowering speed and at 20% nothing happens.
thanks for the help

Hey
It works on slightly yellower paper.
So problem solved.
Thank you for helping