National flag common for colours to be presented in bands of three. It is common for many flags to feature national symbols, such as coats of arms. National patterns are present in some flags. Variations in design within a national flag can be common in the flag's upper left quarter, or canton. The most popular colours in national flags are red, white, green, dark blue, yellow, light blue, and black. The occurrence of each colour in all the flags is listed in detail in the table below. The table shows that the colours light brown, dark brown and grey only occur in
Flag of Australia have trouble displaying the shade of blue in the table above. The flag may be reproduced in a single colour, with the colour being either black or one of the two colours of the flag, albeit blue is generally preferred for single-colour productions. Guidelines for flying the flag are laid out in the 1953 Flags Act and in a pamphlet entitled "The Australian National Flag", which is published by the Australian Government on an infrequent basis. The guidelines say that the Australian National Flag is allowed to be flown on every day of the year, and that it "should be