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I'm going to the seaside at the weekend, and I plan on using my watercolours while I'm there as a way to relax. I have these brushes that can store water in the end of them so I don't need to bring a water pot. However, if the water runs out, I want to know if it's okay to refill them with water from the sea. That way, I don't have to worry about bringing extra water with me. I'd like to know if using the sea water would have an effect on the quality of both the paint and if it'll damage the brushes.

  • Certainly it is possible to paint using watercolors with salt water. However, I would be a little concerned that dissolved organics in seawater may ultimately result in a non-neutral pH on your paper. So, although you can do it, the archival quality of the paper could potentially be affected. If you're a hobbyist, this is probably no big deal. If you intend to sell your work, archival issues are really important. Personally, I wouldn't risk it unless I could find historical evidence that painters of yesteryear used seawater and their work survived the test of time. – Matt Aug 28 '17 at 22:49
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Yes, you can use salt water with water colours. But remember, table salt (or salt water)is highly hydrophobic. Salt repels water. Anywhere salt is present on your paper it will repl water way from the area. The water colour pigments floating in your solution will concentrate around the salt particles. As the water is pushed away from the salt you will get concentrated areas of pigments in those areas where salt particles are present. So if you are looking to achieve a spotted texture on the surface of your water colour painting salt is a good choice.

As an experiment try sprinkling some table salt on the surface of your water colour painting, the sprinkled salt will create a more pronounced effect as the larger salt crystals in the table salt will repel a larger amount of water.

When done painting clean your brush with regular tap water. This will keep a layer of salt precipitating out on the hairs of your brush as the salt water drys.

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    The end result might be spotty as you say, but NaCl is hygroscopic. It attracts water; it doesn't repel it. – Chris H Aug 30 '17 at 12:35
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    You are correct. Table salt is hydrophilic and not hydrophobic. I have to correct this write up. Thanks for the correction. I should also include an example of the spotting effect. – John Vukelic Aug 30 '17 at 17:26

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