Color blindness, also known as color vision deficiency, is the decreased ability to see 
Do you know what colors are most commonly hard to see with the color blindness illness?
Its not about color but vision.it's a decreased ability to see color or differences in color.  
Ohh I see. What do people with color blindness do to cope with the effects of it?
People with total color blindness, however, may also have decreased visual acuity ,and rarely cope in brightness 
When was color blindness discovered to be a thing. How did people realize that they had a decreased ability to see color compared to people with normal vision?
common cause of color blindness is an inherited fault in the development of one or more of the three sets of color sensing 
That is really sad to hear that some people can't see beautiful colors. Are there any known cures or solutions to color blindness to present?
Gene therapy for color blindness is an experimental gene therapy aiming to convert congenitally colorblind individuals to trichromats by introducing a photopigment