What does NOT mean? I can't remember.
Not is a surface or Watercolour paper. It can be called Cold pressed or Matt. and it is a popular surface .
There are three main types of Watercolour paper surface:
1. HP (Hot Pressed) - This paper is quite smooth, with only a hint of a surface texture. The surface is extremely popular with botanical artists, who produce very high detailed work.
2. CP (Cold Pressed) - Also known as 'NOT'
This is a very popular middle surface texture for watercolour paintings. The surface has a medium texture suitable for the majority of work.
This surface is also known as NOT, and refers to the paper not being hot pressed.
3. Rough - The surface is very textured, with lots of natural peaks and troughs for the watercolour pigment to collect in.
Rough paper is fantastic for landscapes and seascape paintings where the rugged nature of the surface enhances the composition on the painting. The Rough surface is not always easily distinguished by looking at the paper and can only be noticed when the paint is applied.