Making Indicator Paper/Experiments

Red cabbage, finely chopped - slow boiled over low heat in distilled water for a couple of hours to extract the flavin to make dye:
[ Red cabbage contains a pigment molecule called flavin (an anthocyanin). This water-soluble pigment is also found in apple skin, plums, poppies, cornflowers, and grapes. Very acidic solutions will turn anthocyanin a red color. Neutral solutions result in a purplish color. Basic solutions appear in greenish-yellow. Therefore, it is possible to determine the pH of a solution based on the color it turns the anthocyanin pigments in red cabbage juice.] More indepth instructions can be found here.

Paper dyed  in the solution - I've found that over night works best. Paper soaked for a shorter amount of time seems to fade more quickly.

Air dried - hanging paper up means it's not sitting on something it can react to...

Different paper types.

Portrait comparison. Graphite / memory of water.