https://theconversation.com/dynamic-tattoos-promise-to-warn-wearers-of-health-threats-133040
Ever since Sits had gone mainstream as an early warning system for possible infection, they’d been hacked to warn of other things. The Blockers had got them to glow when you were in what they called an “unhealthy ad space”. The Hiders had them signal when your data was being siphoned. She read Sits, hacked or not. Sitting and drinking the client’s beer, wearing the client’s shoes, she waited to start a conversation, watching the tattoo for the telltale situational signs. She turned the bottle’s label and watched. The Sit glowed pale green for a second. She began to talk.