Our CMYK Color Wheel Chips which can be found here for purchase are excellent for choosing chip colors when you decide to customize your ceramic poker chips, buttons or plaques. However, always remember that choosing colors based on what you see will only work if you can actually "see" them. That means that we are often making color decisions in really poor light. Often we assume the lights in our rooms or environments are lit well enough for us to make important color decisions. We get dressed in half lit rooms. We read under really dim lamps.
When choosing your chip colors you should be viewing the CMYK Color Chips in direct rather bright light. It's a good idea to turn on a bright desk lamp and get plenty of light when looking at these Color Wheel Chips. You want to have the best available light when making color choices.
Color professionals (yes, there are color pros) often use big overhead lamps or even huge desktop size booths with daylight rated lamps in them so that they can fully experience the colors they have to choose or create. You should try your best to get some good light.
I use an extra desk lamp that is portable so I can fold it away when I'm not using it. It has three dimmer levels, runs on lithium battery power and is rechargeable.
Here's a link to the lamp I use.