Same process used here:
http://sveinhandmade.blogspot.fr/2014/06/teinture-converse-1970.html
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Same process used here:
New project, dye a Commando sole Trickers brogues pair in black.
La paire est en très bon état, quelques plis d'aisance, mais la semelle est comme neuve, on dirait qu'elle a été ressemelée récemment.
The pair is in very good condition, a few creases on the front, but the sole is brand new, it looks like it has been reheeled lately.
Nail polish remover with acetone + Saphir black dye + Saphir black polish cream + Brush
I started by removing the varnish in order for the paint to stick to the leather:
Liquid dye quite easy to put with the "sponge" supplied. I only needed to use a small brush in order to reach some difficult parts:
Here is the result at the end of the dye, before putting the final polish cream: