In our study subgroup of my guild, "Centered on Color & Fiber", this year we are focusing on two qualities of color, saturation and value. For my exercise in saturation (aka intensity of a color), I have been playing with different ways to desaturate a color, or give it less intensity, when dyeing yarn.
As I'd remembered from previous dyeing sessions, when you reduce the amount of dye in a linear manner, the darker more saturated colors in a series like this look closer in tonal value to each other than the lighter more pastel tints.
The darkest ball of yarn is dyed at a depth of shade (DOS) of 1.0. This means that for every gram of fiber (yarn), I used 1 ml of a 1% dye solution. You can use more dye and get even more saturated color, I guess until all the places on the fiber that can accept the dye are taken. I didn't push that limit. I'm just defining the DOS 1.0 color as my most saturated blue for this project.