Screenprinting involves creating a 'stencil' on a fine mesh screen, and then pushing ink through, with a squeegee, to create an imprint of the design on the surface beneath. Each colour requires a new stencil and accurate registration to create the final image. There are various methods of creating the stencil, such as using masking tape to cover the desired areas of the screen, painting the stencil onto the mesh, or using a light-sensitive emulsion.
I’ve been screenprinting on and off for nearly 50 years, but it’s only in the last couple of years, now that I’m retired, that I can focus on it. Initially I painted directly onto the screen, but then I started making more and more complex paper cut-outs, and more recently, since joining the Oxford Printmakers Co-op (http://www.oxfordprintmakers.co.uk) I've been adapting photographs using Photoshop and transferring images onto screens using light sensitive emulsion. More recently I've been doing CMYK printing (CMYK stands for Cyan, Magenta, Yellow, and Key - as those are all the colours you need to create an multicoloured image from dots of ink).