Question on Ti-67 IDF color using Gunze Mr Color

Hi all,

I am builting a Trumpeter Ti-67.
Any one out there know what is the color mixing
to achieve th Gray that the IDF used ?

The instruction sheet says that it is 70% Kahi Drap
+ 30% Tan...., but this does not give the gray the the
IDF used .....

Please help.

Mikado70....