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. Author manuscript; available in PMC: 2019 Jan 30.
Published in final edited form as: Lab Chip. 2018 Jan 30;18(3):505–513. doi: 10.1039/c7lc01116d

Fig. 3.

Fig. 3

Switching chemicals without cross-contamination. (a) Operational state of the system leading to the selection of blue and green chemicals at Stage 1 and green chemical as final stimulus at Stage 2. (b) Pictures showing transitions (1) from green to red, (2) from green to blue, (3) from green to yellow. Switching from green to red or blue is achieved by directly switching green inlet pressure with the red one or the two couples (green-red) and (blue-yellow). Switching from green to yellow includes an additional step where blue is replaced with yellow before switching green and yellow.