The property possessed by an object or substance with respect to light reflected by the object, that can be determined visually by measurement of hue, saturation, and brightness of the reflected light.
Wiggle the fingers on the chin or lower part of the face.
Not to be confused with the sign SPEAK -- different palm orientation and handshape ("4" for SPEAK contrasting "5" for COLOR).
First 100 words.
As you feel more comfortable with the first few hundreds of ASL signs, progress further with your vocabulary and learn signing more.