I'm not about to ruin a brand new pair of shoes proving it wasn't prepared right. I think where I went wrong is I didn't heat it up enough.
Never the less, it's not dark in the jar, so I'm going to dump it.
I have, meantime, ordered and received store bought dye from a little internet company in the states and my now black shoes are perched on some old newspaper, drying.
I can hardly wait to wear them this weekend!