What does this gray part of the CP means?

[nreek]

I have this CP of a Eagle from Hgung, but what does the gray part means?

http://s16.postimage.org/r59k782it/Eagle_CP_Hgung.jpg

(if someone has a CP with Mountain and Valley fold marks, could sent to me?)

[GWB origami]

usually gray parts mean it is not really used.

[nreek]

So, should i cut it out, or what?

[kowal]

you should fold it back and fold it like it is part of the rest of sheet - i mean, fold those two layers as it was one.
if the model assumes color changes, you should check on which side the paper is folded back

[nreek]

Oh thank you, now it is very clear to me