This post contains a handy tip about testing paint, to check the colour, before applying it to your picture. I have to admit that I don't always do this, but if you can get into the habit of checking the colour first it can prevent some ugly mistakes.
I recommend testing colours on a spare piece of paper before applying it to your painting. This can save you both time and stress. Mainly because acrylic paint can dry almost immediately, so often you cannot just wipe it off. Here's a tip that you might want to try.
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Painting Tip especially for Square Paintings
This is a handy tip for pictures painted on paper. Often you'll be painting a picture that will not fill the size of paper you are using. A good example would be a square picture on a rectangular piece of paper.
Mark off the painting area
It can be useful to draw in a light line to mark the edge of the picture.
When you do this you can use the spare section to test colours on. You'll be trimming the paper once the picture is complete anyway, so you can use this part as a colour testing section.
One of the main benefits of this tip is that the tested colour is very close to the painting and it is easier to see how it will look. Also, as it is on exactly the same painting surface there is be no variation.
Mainly for paper surfaces
Obviously this tip will be best for paper surfaces that are easy to trim. It wouldn't be suitable for stretched canvases. But you could probably use it on a canvas panel if you were going to trim it anyway.
However it's usually easier to trim a canvas panel before starting to paint. When you trim a canvas panel before it is painted you don't need to worry about marking the painted surface.
Try to get into the habit of testing the paint colour, it can save a lot of time and make your painting more enjoyable!
