Consumer Reviews and Complaints. I am very happy with my experience with Merry Maids. My maid is a 25-year old lady and I'm an older woman and a grandma and she reminds me of one of my grandchildren. She cleans everything and does a very efficient job.
There are two main types of color mixing: additive color mixing and subtractive color mixing. Additive color mixing is creating a new color by a process that adds one set of wavelengths to another set of wavelengths. Additive color mixing is what happens when lights of different wavelengths are mixed.
SUBTRACTIVE colors are like paint. For additive colors, you can make yellow from adding red and green light. Or yellow, being a spectral color, means that light of a pure certain wavelength, around 570nm, is itself yellow. For subtractive colors, yellow indeed is a primary, and is the reason that the inks coming from most color printers are NOT red, green or blue, but rather cyan, magenta and yellow (and sometimes black).