What does GSM mean?
GSM stands for Grams per Square Metre and indicates what the weight of the paper or card would be if it were 1m x 1m in size (i.e. 1 metre square).
What are Spot colours?
Spot colour is not made using the process colours. A spot colour is the colour is printed using an ink made exclusively. Each spot colour requires its own separate printing plate.
Spot colours are generally defined by the Pantone Colour Printing System. (PMS) colours.
Digital Printing is different, as the printing devices can only reproduce from the four process colours; cyan, magenta, yellow and black. This is generally known as CMYK.