I was asked by a lady in an online group to which I belong, if I would share the technique for my Mokume Gane work which has a thin black outline to define the patterns. I’ve added it below with some more examples in case it’s of use to others, Jane x
Jane Hewitt 
I love you Mokume Gane results. They are brilliant!
Thank you so much x
Your instructions are THE BEST I have found! They are crystsl clear and you have thought of EVERYTHING needed to be successful at creating gorgeous MG patterns! Thank you so much!
Oh thank you so much, your kind words have really made my day x