@Philip_Britton Tweet 11/12/2015 12:04 PM Tweet 11/12/2015 12:04 PM Posted by Bolton School on 11 Dec 2015 Modified by Bolton School on 16 Sep 2023 @Philip_Britton RT @Chem_BoltonSch: Poinsettia indicator paper with different buffer solutions: here's a good example from 8e