How long can spark plugs last? There are two types of spark plugs: conventional and long-life (platinum- or iridium-tipped). Conventional spark plugs need to be replaced every 30,000-50,000 miles. Recommended replacement intervals for iridium- or platinum-tipped spark plugs vary between 50,000 and 120,000 miles. To find out the recommended replacement interval for your car, check your maintenance schedule.
Its key principles: (1) the three primary colors are red, yellow and blue, (2) the primaries exist as three material substances (often identified with specific pigments), (3) the primaries cannot be mixed from other colors, but can mix all other colors.
Blue is a primary color (along with green and red). It isn't a color you make, its a color you are given (but not true with all primary colors hence blue + yellow = green). You can mix two primaries to get a third level of color.lue red and yellow are the primary colors of light. These three can be combined to make all other colors.Being a primary color means it cannot be created by mixing any BASIC colors. You can create blue if you take the yellow hue out of green though.