Controllable read blocking based radio-frequency identification

A controllable read blocking based radio-frequency identification (RFID) device comprising:

• a substrate layer;
• a trace formed of a conductive material and disposed on, partially within, or fully within the substrate layer;
• and
• a controllable read blocking layer disposed on the substrate layer and the trace and including a first fluid disposed in a first sealed reservoir in the controllable read blocking layer to selectively block or allow passage of electromagnetic waves to the trace to respectively inhibit or allow communication of a RFID reading device with the controllable read blocking based RFID device, wherein
• the first fluid disposed in the first sealed reservoir is in controllable communication with a second fluid disposed in a second sealed reservoir, and
• the controllable communication allows or prevents mixing of the first and second fluids.