I know Crayola is a kid brand, and I don’t think Crayola Washable Markers are made for watercolor artists. However, for your daily doodling, and small art projects, they work wonders. The markers have conical tips that allow both broad and thin lines, and the colors are quite vibrant:

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I recently got hold of a different brand, Tombow Dual Brush Pen Art Markers. You can see from the way it’s packaged (Primary, Secondary, Grayscale, Portrait etc.), Towbow is for artist. With a nylon brush on one side and a fine tip on the other, you can achieve more versatile marks with it. I tried Tombow and Crayola side by side and find them behave similarly:

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A few notes:

• I used 140lb watercolor paper, and all my paintings are small.
• The colors are quite vibrant and they don’t dry lighter. However, if you have excessive water, it will wash the ink away.
• You can go back lifting or adding colors. If you add colors with markers when the paper is wet, remember it is much hasher on the paper than applying watercolor with watercolor brushes.
• As for lightfastness, both Crayola and Tombow claim their colors will fade over time. So maybe not use them in your masterpieces? The prickly pear flower one (top right) was on the wall without any protection for many years and I haven’t seen any color change yet.
• It is convenient and fun!