How to test the color sample on the walls

Choosing the paint for the walls of the house is a confusing matter that takes you a long time, as you want to apply modern and different colors in each room to give a unique character to the place. When we adopt a certain color tone of colors for all interior design works, a test of that sample of color must be done on the site under natural light (day light) for the clarity of the true color tone, due to the difference in the degree of color under artificial lighting.
That is, you have to make a sample in the form of a square, approximately the size of a textbook, and leave it for a whole day or two until the paint dries completely.. The color may change to the required degree on the second day and also the color may vary according to the different lighting in (during the morning, the lighting is natural (sunlight) During the afternoon and evening, the lighting is artificial. After that, a choice is made whether the color is suitable or not.
reference: اصباغ اصباغ