In the March 2016, we published an article by Ken Lyle on different colour demonstrations. Here is the article plus links to the articles referenced.
Chemical rainbow (March 2016, Chem 13 News)
Chemical Sunset (February 2016, Chem 13 News)
Milk demonstration (December 2014/January 2015, Chem 13 News)
Colour calcium alginate pearls in article called "Chemistry and our health" (October 2015, Chem 13 News)