  Environmental hazards often go unnoticed because they are invisible to the
naked eye, posing risks to our health over time. Project Calico aims to raise
awareness of these risks by augmenting everyday fashion with color-changing
chemical sensors that can be observed at a glance or captured by a smartphone
camera. Project Calico leverages existing cosmetic and fabrication processes to
democratize environmental sensing, enabling creators to make their own
accessories. We present two fashionable instantiations of Project Calico
involving UV irradiation. EcoHair, created by hair treatment, is UV-sensitive
hair that intensifies in color saturation depending on the UV intensity.
EcoPatches, created by inkjet printing, can be worn as temporary tattoos that
change their color to reflect cumulative UV exposure over time. We present
findings from two focus groups regarding the Project Calico vision and gathered
insights from their overall impressions and projected use patterns.
