Watercolour paper was traditionally made from cotton.
Today, you can get watercolour paper made from cellulose (plant cells) or
synthetic materials, like polypropylene.
Watercolour paper is heavier than regular papers. It
is made in four weights: 90 lb, 140 lb, 200 lb and 300 lb. The heavier the
paper, the thicker it is. You choose the weight based on the amount of water
that you will apply with your paint. The more water that you use, the heavier
you will want your paper.
Sizing is added to the paper fibres to make the watercolour
paper stronger and to help it to keep its shape. The fibres are then beaten to
help them interlock. Next, the pulp is pressed and then dried.
Pressing is usually done by a machine. A cold press means
that the sheets of pulp are pressed between rollers that are covered with felt
and it is done at a cold temperature. The felt gives the paper a texture. Hot
press paper has been rolled between smooth heated rollers; hence, it has little
or no texture.
For cardmaking techniques, 140 lb cold pressed
watercolour paper is great, especially if you like that awesome texture. You
can use a paper trimmer to cut it and it won’t get stuck in a decorative punch.
It will also handle moderate amounts of water without buckling or stretching.
If you need more time to play with the paint, use hot pressed watercolour
paper. Either way, watercolour paper will create new and interesting
possibilities for your cardmaking. Give it a try!
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Reference: https://jenniferbranch.com/PaintingWatercolor/Art-Supplies/Art-Paper-Basics.html