Topic: Old black henna mixed in a jar

I used to use the black henna mixed in a jar with good results.  It did not turn my hair too black with a tinge of red, which is my hair color.  With the new packaging separating henna from indigo, I found the black too black for me but I have already purchased 3 packages.  To revert to the old result, can I mix the henna and indigo in a jar and use it like before?  i.e., in one step instead of two steps?