Gsm , thickness, cotton paper , grain… How should you choose your watercolour paper depends on a few factors. It also depends on how much water you use for an ideal rendering, it shouldn't buckle or bleed.
Here are a few pointers!
Watercolour paper is ranked by number of grams per square meter, generally between 180 and 800 g. The higher the grammage, the more resistant the paper is to paint and water.
Are Grammage & thickness the same thing?
NO Grammage is not the same thing as paper thickness, just as thickness is not the same as paper weight.
- Grammage: weight of a square meter of paper.
- Thickness: that of one sheet of paper, measured in microns.
The choice of grain depends entirely on what you want, on your subject, and on the way you'll be working with it. In a nutshell, everyone picks a grain according to their needs!
Hot Pressed (Smooth): Hot Pressed Watercolour Paper provides a very smooth surface that works perfectly for narrow lines and doing details.
Cold Pressed ( Medium) Cold pressed Watercolour paper is the most frequently used texture. Its surface, neither too smooth nor too rough, slightly rougher than hot pressed finish, and easy to use and adapt to almost any situation.
Rough (torchon grain) Rough Watercolour paper given its coarser texture tends to erase details, it requires considerable technical mastery. While not suited to highly detailed subjects, it works perfectly for colour and relief effects.
Test the paper!
To learn about the features of various papers, there's nothing like doing a little test. Load a dry brush with paint and apply the paint.
- On paper with a Smooth finish colour will be more uniform.
- On Medium grain paper the paint will fragment slightly and the edges will be irregular.
- On rough grain paper, the paint will not cover dips in the paper, producing a very fragmented rendering.