In this lesson, Part 2 of our Color Science trilogy, students use colored candies, LED lamps, and/or smartphone flashlight apps to further investigate color perception. A red light source, green light source, and blue light source will be separately shone on opaque candies of varying color (i.e., M&Ms) and translucent candies (Gummi bears). This allows learners to predict how color perception changes through light filtration or color mixing. The activity explores how pigments are similar to filters (and work by subtraction of light). Part 1 of Color Science explored RGB color addition; this lesson carries the idea forward to examine the colors cyan, magenta, and yellow (CMY). These are known as the Primary Subtractive Colors because they can be formed by subtracting one of the Primary Additive Colors (red, green, or blue) from white light.