The red wavelengths of light are the longer wavelengths and the violet wavelengths of light are the shorter wavelengths. Between red and violet, there is a continuous range or spectrum of wavelengths.
The USPS also includes that a large postcard is 49 cents to mail. The maximum size for this postcard is 11 1/2 inches long, 6 1/8 inches high and 1/4 inch thick. This is the same rate to mail a First Class 1 ounce letter domestically. The rates for postage increased as of January 2014.
Direct Mail Postcard Average Costs The cost of a direct mail postcard is dependent on several factors: the size of the postcard, the number of colors you use and the complexity of design. There are fees for the cost of design and printing, and separate fees for postage. Typically, postage makes up the bulk of the total price. Direct mail postcard companies charge on a per-piece basis. Most postcards fall in the range of 50 cents to $1 each, including postage. Many companies offer volume discounts for large orders. For example, a 4 X 6 postcard might cost $.70 if you order 1,000 but only $.50 if your order 5,000. You might be able to negotiate an introductory rate as low as 25 cents per post card. Direct mail companies offer discounted rates for first-time customers to entice businesses to try their service.