I have no experience with the watercolour pencils that SU sells as to their pigment strength, but I do work with and teach others fine art classes using watercolour pencils. All of the pictures in the world are not going to help you develop an understanding about how to use these pencils as much as plain old practise and experimentation will.
...take a long scrap of paper (3"x8" at least), pick a pencil and scribble a swath of colour about an inch or so wide (top to bottom) - use very heavy pressure to start almost pure heavy pigment, for about a half inch, then let up on the pressure for the next half inch, then let up on the pressure again and so on, and so on, until the pressure you are applying is just very light, faint lines of pigment.
Now - take a damp (I don't use the aquapainters, they don't give enough control over the water) watercolour brush, start back at the heavy end of your line and loosen up the pigment with the water in your brush, then pull the colour out away from the line either up or down, not both ways. Continue to do this all the way to the end, rinsing your brush out after each pressure change and try to keep the brush consistently damp for every gradation in pressure. (you could also do this by making a chart and filling in boxes of varying pressures but the long scribbled line is faster and should get the point across)
Once you complete this exercise you should at that point have a pretty good idea of how much pigment you have to have on the paper to get a nice strong image or a very delicate washed out one! YOu also have to learn how to control the water in your brush - this as well comes with practise. As well the pigment strength in each colour of pencil is not consistent - some apply very easily, some require more layering, this is because of the difference in the actual pigments and how much binder is required to get them to stick together in a pencil lead shape.
...you can layer the pigment if it isn't dark enough too - just make sure your paper is completely dry before you add another layer of pencil - doesn't have to be the same colour either, you can make a whole new colour by layering one colour over another.
..if you have any more questions, send me a PM I will be around most of today, not sure what we are doing this wknd, but I will get back to you as soon as I can
..art is about discovery - you gotta play to learn!
J
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