http://jel87.blogdrive.com/ Jels tells Wed, 16 Apr 2008 22:10:06 PDT http://www.blogdrive.com Copyright 2008. Entertainment http://jel87.blogdrive.com/archive/1.html Thu, 17 Apr 2008 06:08:13 GMT I've done it for several years with great results. Basically any strongly colored plant matter will work. Even something as simple as grinding frozen spinach and collecting an aqueous extract works ok. Flower petals work great, especially roses (IIRC, red ones give three or four distinct color changes). One thing I introduced last year was to have them start with solid plant material and do their own extraction in the solvent of their choice. It generated really interesting discussion when groups using the same plant material got an indicator with different properties because some used... (more) http://jel87.blogdrive.com/comments?id=1