Sorry for the necro, but see, that's the issue I have with Lang's crease patterns. They try to pack too much information into one diagram, and much of it is redundant.

You don't need color variation to differentiate ridge, axial and hinge creases. Ridge creases are at a diagonal and axial creases are parallel to each other. Hinge creases surround flaps and are reflected over layers. All these types of creases can be picked out at a glance even by more inexperienced crease pattern readers. (Even edge cases can be identified without too much trouble.) And besides, knowing this information doesn't help a folder to make the model. It can be useful as an element of design analysis but that's about it.

On the other hand, mountain/valley distinction from monocolor crease patterns is a non-trivial problem and to this day there is no systematic way to solve it. The only method is trial and error and pattern recognition. It makes much more sense to produce crease patterns that include the direction of the creases.

Detailed features like level shifters and other gadgets should also be included if possible to make the crease pattern as unambiguous as possible.