If all 9th small squares of our hieroglyph are linked with certain colors, then for most letters the number of required signs will be halved. We are talking about those letters that have 2 vacancies. You can depict any one of them in the desired box, except the color of the box containing the second sign.
To make it easier for us to remember places of colors, let us remember the image of the rainbow.
But the difference of our “rainbow” with the common one is that the colors do not change across the axis of the rainbow, but along it. In the center is white, as the base of all colors, and below and in the middle – purple.
So let’s put it together.