A glob of liquid white glue, a dash of borax and warm water makes slime, Madhvi Chittoor knows. A bit of dye — blue and yellow makes green, of course — doesn’t hurt either. Sodium hydrogen sulfate and tin chloride mixed in a petri dish will grow tin dendrites — metallic, crystalline structures — if there’s a bit of electricity to spark the chemical reaction. “It’s literally growing right in front of your eyes,” Chittoor said, sliding the petri dish across her family’s tile floor, her eyes wide behind protective goggles. But what’s the recipe to phase out the sale of PFAS — forever chemicals linked to cancer and birth defects — in Colorado?