From the 'new' updated Thorn brochure (online)The Club Tour Mk4 frames and all 3 fork options, are 
available in a choice of 2 finishes; Gunmetal or R&B. 
The Gunmetal finish has a deep lustre, which 
appears to change from silver to deep pewter, 
depending upon lighting. Black decals complete the 
sophisticated look. 
The R&B finish is Cobalt Blue Imron at the rear and 
Blood Red Imron at the front. There is a 6mm white 
diagonal line separating these colours. R&B forks 
have a red crown and blue blades. The decals are 
Navy blue and white. This is a much livelier finish! 
But it still looks “classy and patriotic”. 
The frames are treated internally with a rust 
inhibitor; the outside surfaces are sprayed with a 
rust-inhibiting primer. 
The frames are then sprayed with highly-durable Du 
Pont Imron twin pack polyester paint, as used on 
aircraft. 
All the decals including Reynolds 725 decals, are 
applied and sealed into the finish with twin pack 
polyester lacquer. 
This colour scheme (R & B)  is 'more or less' a reversed version of the previous Thorn Audax 853 (which I loved).
John     http://www.pbase.com/leftpoole/image/128523380