Royal blue is a deep, dark blue that is a common color for fashions, particularly formal and semi-formal dresses. This is originally based on the color of a dress made in the 18th century for Queen Charlotte the Queen of Great Britain and Ireland. It should be noted that purple is more of a royal color with traditions dating back to the Byzantine Empire and the Holy Roman Empire that later spread to the royal houses of Europe. This may be the reason that royal blue often has a purplish tinge. The following are common types of royal blue with a few similar colors.
Royal Azure
#0038a8
Imperial Blue
#005A92
Navy
#01153e
Royal Blue #3
#02066f
Royal Blue #5
#0504aa
Royal Blue
#0c1793
Royal Blue #4
#282a4a
Royal Blue #2
#29217a
Royal Consort
#2e5686
Royal Blue (web color)
#4169E1
Queen Blue
#436B95
Notes
The web color named Royal Blue doesn't conform to the traditional color royal blue. This color was selected by unix programmers in the late 1980s. Many of these colors were approximated from a set of crayons one of the programmers had on hand. This later became part of web standards such as html/css.
Next read: List of Royal Blue Things