Industries available in Temp/Arctic/Desert
Copper Lt Grey
Steelmill Lt Grey
Papermill Lt Grey
Food Proc Brown
Iron Ore Brown
Oil Ref Yellow
Oil Well Lt Blue
Oil Rig Lt Blue
Rubber Off white
Water Lt Brown
Watertower Lt Green
23 different industries with 22 differences (oil wells=oil rigs)
The only significant clashes are
Copper/Papermill/Steelmill are all Lt Grey
Pactory/Printers are all purple
Iron Ore/Food Proc are all brown
Lumber mill/Gold mine/Sawmill are all orange
Oil rigs and Oil wells are fine being the same colour as they appear in either sea or land and supply the same product.
Shops and farms are both pink but shops are small pink squares within towns and shouldn't be able to be confused with farms.
Power stations and Diamond mines are both red. I've no idea if they might appear in the same game but possibly need a colour change if possible.
So, all that would be needed is 6 more colours to separate the main industry clashes. From the FIRS collection, there looks to be at least 4 available (Dk Grey, Dk Red, Lime Green and a medium blue)
I haven't yet delved into doing anything with NML but this might be a push towards doing so. The above list is for anyone as a starter but I'll see if I can do something myself. I agree that for this to work then all industries would ideally need to be different colours.
I'll report back soon.