As a side result of the Purple Ranchu Project, I also get the Brown Panda Ranchu. Actually, it is the Purple Ranchu who demelanizes to produce a purple and white fish. The purple gets darker to produce the appearance of brown / light brown. This process is exactly the same as the demelanization process in the blue ranchu to become panda ranchu (Black and White Ranchu).
As this variety is still rare, I think it is better to document it here for future reference. Here are some pictures:
hermantogoldfish 
I love these! Absolutely gorgeous fish you have bred. I have been binging your blogs all the way back from 2015 lol Extremely impressed with your passion and similar goals for what you would like to breed. I am about to start my breeding journey here within the next 3 months or so, so all of this information has been extremely useful. Would love to collaborate at some point.
Thanks for the appreciation. Glad to hear that.