The three types of watercolor can surely be used at the same time. But some times you may find them not so well mixed when put together. Therefore, when a thick, non-transparent watercolor is mixed in water with a transparent one, you may see some wrinkles and grains. Some artists would even take advantage of this phenomenon to apply some "special effect". For different levels of users, it may be recommendable to use different watercolor.
High school student with art as major: they should have a basic knowledge about watercolor knowledge. May try to use semi-transparent or transparent watercolors for a intermediate and high levels of training. Middle and elementary school students selecting art classes: they should still on entry level in watercolor. May begin with thick color (like gouache) for learning the build-up of spot colors, before trying the highly skillful techniques of water mixing.
- 1x Simbalion Watercolor Cakes 12 Colours -WCC12