Two-toned devore

I have been experimenting with dying devore velvet in order to achieve a two-toned effect.

Firstly I mixed my chosen kenethrol acid dye colours with the fixatve ammonium sulphate and in a separate tub procion mx dyes with sodium chloride. 

The kenethrol dye is then added first into a cold dye bath (hot water not being heated) and the procion dye last. 

In theory the kenethrol colour should dye the back of the velvet and the procion should dye the front, so when it is devored the fabric should result in two different colours.

This however doesn't always work. I only managed to achieve two successful two-toned devore velvet samples.