This is a Northstar CFL reactive experimental color produced in house leading up to the Gaffer X Northstar CFL reactive colors Exp. #31 & Exp. #32. These rods are a light transparent yellow that shift to a light transparent pink. Experiment #17 Light varies in air content and CFL reactivity as shown in photos. When thinned out, this color can lose its reactive properties, so we recommend working it thick for best color shift. A 2700k (kelvin) CFL light source will show the best reactivity for these colors.