Authorities have also introduced a color-coded warning system to alert residents about dengue outbreaks in specific districts.

WSJ: Dengue Fever on the Rise in Singapore

New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.

CNN: New York subway system on alert

One application Sotzing has been working on is meat packaging with a built-in tongue that can taste the first signs of spoilage and activate a color change as a warning.

FORBES: Safer And Guilt-Free Nano Foods

Color Red is no substitute for an Iron Dome defense system, but with as little as 15 seconds between an air defense warning and a rocket striking its target, Color Red offers a little bit of extra time for users to find shelter.

FORBES: Rockets Coming Down On Your Head? There's An App for That