Could I can green peppadews?

This could either be a cultivar that just has lighter leaves, or your potting mix is not correct. You need a well draining mix but it needs plenty of organic...

Yes, this is probably common as some of the blended leaves will be in pieces that are too small for a simple filtering material. If you want to filter as...

Yes, it is. You'll get an added benefits from the algae and other microorganisms that are in the green water.

Brewing method, brewing time, and the quality of the tea will influence the antioxidant levels of tea.

Sadly no, it can't. Chroma keys don't work. Try buying green fabric from the closest craft store.

It may hurt your plant, depending on the dye you use. Look at the labels for organic or natural ingredients.