Copper brown please

[Emzxxx]

Hi there I am qualified up to level 3, haven't worked in the industry for the last 5 years tho, so im bugging myself Trying to make up a formula for a copper brown or cowgirl copper as they say. Im currently bleach all over about an 8 some areas darker,
apart form few inches of probly a level 6. Thanks for any help. Attached is more or less the tone I'm looking for.

 

[ronray]

I'd say Kolesten perfect 8/74 + 8/38

 

[Emzxxx]

I'd say Kolesten perfect 8/74 + 8/38

Equal parts with 6%? Thank you

 

[ronray]

Equal parts with 6%? Thank you

Do strand test first if you can and the adjust formula accordingly