I have found a link for how to make a pH indicator from red cabbage.
Here is a link that might be useful: pH indicator
Lets send this one to the bottem and use the better one below.
Here is a link that might be useful: better link to pH indicator
Link with colored pictures got removed. Does anyone have a record of where it was located?
Here is a link with a full range of colored pictures but they did not label the pH of the pictures in the full range. (Most plants need to be between vitamine C and baking soda.) I am still looking.
Here is a link that might be useful: Link to colored pictures of pH indicator made from red cabbage