Experimentations

I looked on the internet for some train pictures, and settled for the 91101 Intercity 225 "Flying Scotsman":

I initially started tracing the train in Adobe Illustrator, but I included too many colours: dark grey, medium dark grey, light grey, yellow, light yellow, black, and dark purple:

I decided to cut the train down to 3 colours: yellow, light grey, and black:

I then cut out the individual colours and used each template separately in the spray booth:

 Using ink, I sprayed the cut outs monochrome, and then I scanned them in to the computer: 

This is the final experimentation that I came up with: 

I then decided to play around with the colours and techniques, and came up with this: