by Gemma Reguera — Our ap­pre­ci­a­tion of the col­ors of na­ture is lim­ited by the nar­row wave­lengths of the elec­tro­mag­netic spec­trum that our eyes can de­tect. This por­tion of the elec­tro­mag­netic spec­trum be­tween 390 and 750 nm is what we re­fer to as the vis­i­ble (vis) light or, sim­ply, light. We can­not see be­low…