Mike, that's a mistake isn't it?
SR Malachite is, I believe, approximated by Rover Java Green. Another possible match for GWR/BR Green is Rover Brooklands Green.
See: http://gardenrails.myfreeforum.org/archive/car-paint-aerosol-equivalents-for-railway-colours__o_t__t_3605.html.
We mustn't forget, of course, that in many cases (Crimson Lake, Prussian Blue), the final colour is greatly dependent on the colour of the undercoat.
BW
Richard.
Edit. Just found this from RMweb (from Kiwionrails)
QUOTE
BR Loco Green :- Rover Brooklands Green - Ford Laurel Green (poor match) BR Diesel Light Green Band :- Ford Highland Green BR Coach Carmine :- Ford Rosso Red - Vauxhall Carmine Red (both too "fire engine") BR Coach Cream :- Vauxhall Gazelle Beige - Talbot Jonquil BR Coach Cream (well worn) :- Peugeot Antelope Beige (too dark) BR Blood/Custard (approx colours) :- Ford Venetian Red - Talbot Jonquil BR Loco / Coach Maroon :- Rover Damask Red - Vauxhall Burgundy Red - Ford Burgundy Red - Triumph Damson BR Diesel Blue :- VW Pargas Blue - Ford Fjord Blue (Fjord blue is a very light blue like LNER blue!) BR Deltic Blue :- Lada Adriatic Blue BR Steam Loco Blue :- Peugeot Royal Blue BR Loco Yellow Warning Panel :- Vauxhall Mustard Yellow (too orange) BR EMU Green :- Jaguar British Racing Green BR Wagon Grey :- VW Eisgrauen KJ94 BR Wagon Bauxite :- Alfa Romeo Bruno DE37 CR Steam Loco :- Peugeot Royal Blue CR Dark Blue :- Rover Midnight Blue GNR (I) (Ireland) :- Ford Wedgwood Blue GWR Brunswick Green :- Peugeot Conifer (too dark) GWR/BR Green :- Leyland Brooklands Green - Land Rover Deep Bronze Green - Ford Laurel Green GWR Cream :- Ford Sahara Beige (too yellow) - Ford Sierra Beige (too white) GWR Brown (Chocolate) :- Triumph Maple - Talbot Peugeot Cafe Noir (very maroon)- Rover Russet Brown (way too light) LNER Garter Blue :- VW Pargas Blue Ford Fjord Blue LMS Coronation Blue :- Rover Pageant mid-blue LBSC Umber :- Rover Mexican Brown LBSCR Stroudley Ochre :- BMC Tan LBSCR Umber :- Vauxhall Brazil Brown LMS/Midland Crimson Lake :- Ford Damask Red - Rover Damask Red LMS Coronation Blue :- Rover Pageant Mid-Blue - Peugeot Royal Blue (Not sure here but there is a huge difference between these two) LNWR Coach Plum Lower Panels :- Daewoo Dark Red LNWR Coach Bluey-White Upper Panels :- Daewoo Casablanca White LYR Coach Upper Panels :- Plastikote Nut Brown (Not Halfords – try B&Q?) LYR Coach Plum Lower Panels :- Daewoo Dark Red MR/LMS/BR Red :- Rover Damask Red MR Red :- Rover Damask Red - Vauxhall Burgundy Red - Ford Burgundy Red - Triumph Damson NSR Maroon :- Vauxhall Gambia Red NSR Madder Lake :- Ford Lacquer Red NER Coach Red :- Vauxhall Gambia Red Stanier Coronation Blue :- Peugeot Royal Blue SR Malachite Green Green :- Ford Laurel Green (never!) - Daihatsu Tropical Green SR Dark Olive Green :- Land Rover Coniston Green SR EMU Green :- Jaguar British Racing Green SDJR Blue :- Rover Midnight Blue