A. No, they can be used either way unless the design is text/script.
A. This will obviously depend on the screen used but we did a control with the Ebb and Flow screen and managed to get 140 prints from the pot of ink.
A. The extender can be used to thin the ink which will make it go further and also if you add varying amounts of coloured ink to the extender you can mix different transparencies of colour.
A. Screen Sensation is a multi-purpose ink that works on paper,card, fabric, plastics, metal, glass and ceramics.