When creating conjured blocks using black gray and light gray colors the color of black seems to be replaced with see-trough. Here is visual showcase of what i mean.

Colors in showcase are in order: lime, white, black, lightGray, gray

I also admit i like the almost invisible effect that it causes with blocks but it don't seem to be intended on black.

EDIT: It seems its in all stuff that uses colors. So you have almost invisible projectiles, mines and charges using black color.

Intended.