第三种颜色是中间色，通过在色轮上混合相同浓度的主色和与其相邻的次色相混合而成。有三种主要颜色 – 红色，黄色和蓝色;三种二次色（通过将两种原色以相同浓度混合在一起制成） – 绿色，橙色和紫色;和六种三级颜色 – 红橙色，黄橙色，红紫色，蓝紫色，黄绿色和蓝绿色。传统上命名第三种颜色，先用原色开始，然后用辅助颜色开始，用连字符分隔。第三色是12部分色轮中主色和次色之间的台阶。如图所示，12部分色轮由主色，次色和第三色组成，其中＃1表示原色，＃2表示次色，＃3表示第三色。一个由6部分组成的色轮由主色和次色组成，3部分色轮由原色组成。 “通过调整主要和次要颜色的比例，您可以创建各种细微的颜色。进一步的中间色可以通过反复混合每个相邻的对来完成，直到你有一个几乎连续的颜色过渡。
英国布鲁内尔大学Essay代写：第三色和混色
Tertiary colors are intermediate colors that are made by mixing equal concentrations of a primary color with a secondary color adjacent to it on the color wheel. There are three primary colors – red, yellow, and blue; three secondary colors (made from mixing two primaries together in equal concentrations) – green, orange, and purple; and six tertiary colors – red-orange, yellow-orange, red-purple, blue-purple, yellow-green, and blue-green. It is traditional to name a tertiary color starting with the primary color first and the secondary color next, separated by a hyphen. Tertiary colors are the steps between the primary and secondary colors in a 12-part color wheel. A 12-part color wheel consists of the primary, the secondary, and the tertiary colors as in the image shown, with #1 representing the primary colors, #2 representing the secondary colors, and #3 representing the tertiary colors. A 6-part color wheel consists of the primary and secondary colors, and a 3-part color wheel consists of the primary colors. “By adjusting the proportions of the primary and secondary colors, you can create a wide range of subtle colors. Further intermediate colors can be made by repeatedly mixing each neighboring pair until you have an almost continuous transition of color.”