My first coloring book memory was traumatic and soul-destroying.
I was five years old, and had colored the last page of my book—all simple line drawings with the colors to use in each space printed in bold letters with an arrow pointing to the appropriate area. I chose different colors: colored the shirt that was to be green, yellow, the pants that were to blue, became green, etc, and joyously took it to school to show Sister Norberta, my first grade teacher, who immediately and loudly scolded me for not being able to read or follow directions.
My own young kids got a sheet of paper to scribble spaces on and color however they wanted.
The 1960’s prang crayons are softer and more blend-able than crayolas ever were, (I have about 18) then prang changed the recipe. I now prefer oil pastels (several brands, large variety of colors) to crayons, but of course PAINT—wc, gauoche, or OIL to pastels, and again, a LOT of colors.