As a lay student of color, this book was written with the me of 100 years ago in mind, but now it's hard to know if it's of any true use to me any more. Certainly there were passages that seemed informative, but a lot of the technical discussion of color and it's properties seems wildly out of date in a world with computer screens and color pickers.
So instead I just tried to read it as an interesting point of view and historical account, and I enjoyed it for that. The passage about color-blindness was very interesting, and then she threw out this quote that cracked me up:
"A person so color-blind as to see no difference between the scarlet of a geranium blossom and the green of its leaves... is still and enthusiastic and seemingly an intelligent admirer of landscape and art. One cannot say from what the enjoyment arises, but it is certainly there." (9)
This is a little unfair though, she doesn't come across this callous again and is generally much more thoughtful, like this part about studying nature I enjoyed:
"Students in art and science are constantly bidden to go to nature for the abundant secrets she is ready to reveal to those who seek and prize them, and why should not workers in simpler, if not lower, occupations, be sent to the same source, which is so bountiful as to contain something for every one, and so, profiting by her fulness, learn at the same time to find contentment and joy in their work?" (114)
Ultimately this was my main takeaway, her love of color and the inspiration we can draw from natural sources, so well exampled in her fabulous plates at the back of the book.