With aquatint gel you can apply very focused color with a handy dosing bottle. The colors are nicely fresh and bright ideal for creative work. Just for information about this product:

Collall Aquatint gel: Water colour in gel form with highly concentrated, high-quality dyes.

Properties: vibrant, bright colours that are easy to mix with each other. Ideal for painting vertically, without draining the paint off the paper. AquaTint Color Gel can even be applied directly from the bottle to the paper so you can create beautiful contours, stripes and dots.

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Wist niet eens dat die dingen nog bestonden hahaha, maar super leuk idee zo en inderdaad ook nog een mooi kaartje over om te gebruiken 😉👍
Gracias por enseñarnos, está semana lo haré con mi sobrina
Dat is fantastisch leuk om te doen! Mooi effect krijg je dan, een toverei!
maravillosa técnica y un gran colorido...muy hermoso!!
Fun to play with! Children love it I think, because they can see different colours and mixtures coming out of the spinning :)
Well, and they liked that, huh?.....
Es una técnica maravillosa y divertida. Gracias por mostrar.
Leuk gedaan
Guao is magnificent. My son is very happy now