Yellow Drywall?

[jgbiii]

Any drywall experts out there? We’re exploring the depths of drywall that has been here for a few layers of paint and wallpaper and got to this yellow. Anyone know if this is the drywall (painted or otherwise)? Have we gone too deep and taken a layer off the drywall itself?

One point of feedback was this could be moisture/mold resistant drywall.

Any thoughts?

 

[Turbogus1]

I've noticed on the Holmes and Holmes program the sheetrock for bathrooms is yellow up in the Great White North, but the color of your photo looks brighter yellow that that stuff.