With construction of the final design complete we carried out a more thorough validation test using our Syrris Asia flow chemistry system. Running THF as the system solvent we injected sequential slugs of dilute iodine in THF (as a coloured, positive control) followed by IPA and then ethyl acetate. All slugs could be clearly visualised as distinctly different to the THF system solvent -confirming the device works as anticipated (Figure ).