5F-PB22 Blend Ratio?

[russiankush]

I am interested in making my own herbal blend due to the questionable (and might I add extremely expensive!) blends available in the headshops within one hour of my home. I have found multiple sites in the UK advertising 5F-PB22 for a good price and I have heard some good things about this RC in terms of effects. I have found the instructions on making blends with other chemicals such as JWH but so far have not been able to find a gram of herb/milligram of RC ratio for this one even after extensive searching. I would appreciate if someone could indicate how much of the chemical to use to make a blend of moderate strength.