Please be aware that to extract indigo dye from dried leaves is more difficult than with fresh leaves or pigment powder due to the fact the pigment has dyed the cellulose of the plant leaves. 

You will need wood ash to "un-dye" the cellulose, lime as a base and a fructose of some kind to use as a reducing agent. Of course you are free to experiment for yourself!

Michel Garcia has a fantastic video on how to extract dye from dried Persicaria tinctoria here: https://www.youtube.com/watch?v=wEH1OMvTuQM 

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