Strathmore 105-978-1 Artist Tile Pack, Toned Gray (105195)

will this paper bleed?

Is this paper good for origami? For example, if you fold it does it keep a crisp fold or does it start to break apart on the fold because of thickness

Can I use light watercolor washes or ink markers well on these?

What kind of pen or pencil are you using on the black paper? Gel pens??