|Diazo Photo Emulsion|
A polyester screen fabric is recommended as nylon will stretch when used with water-based inks, and as it is necessary to scrub the screen to reclaim it, silk and organdy screens should not be used either.
To start, the screen is thoroughly cleaned to remove any grease (see Mesh Prep Gel) and the coated with sensitised photo emulsion with a squeegee. It is then placed in a dark room and allowed to dry.
|Use a high contrast image|
The screen is then placed below a bright light source and where the light is blocked by the film positive, the emulsion will remain water-soluble and will wash away after the correct amount of exposure (see Photo Emulsion Exposure Fact File page for further information). The remaining emulsion will have been hardened by the light and act as the stencil (or resist).
You can find out more about Screen Printing techniques from the George Weil Fact File or browse the range of products in the Screen Printing section of the website.