You can show prices of products in red if they are extremely low, which attract the eyes of your visitor, or in green when the prices are acceptable. So you can also use the color green intentionally to reassure your customers with, for example, the text “no credit card required or free or direct access.

Or make use of green V's and bullets.

For example, blue can be used for transefering businesscommunications and linking.

All major companies on the internet know very well what they are doing and how they can attract and retain your attention. They test that with A/B tests. That is how it works. They make different banners for the same product and keep track of how often a particular advertisement is clicked on, when and by whom.

They really test everything you can think of, one ad does well in the morning, the other in the evening. One advertisement attracts young people, the other elderly.

You are constantly tested on the internet. Your movements are followed from A to Z. They try subtly, and sometimes less subtly, to seduce you into an action. Without being aware of it, we are test animals for large internet companies.It even has a name...

Persuasive Design