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The standard rule-of-thumb is a colored filter will selectively lighten its color, while darkening other colors, especially the complementary color, as the filter passes that color while attenuating others.
Embossed black serial on yellow plate; black lines at top and bottom borders; "KANSAS 1929" at bottom none: 123-456 1 to approximately 507-000 First use of the full state name. 1930 Embossed white serial on black plate; white lines at top and bottom borders; "KANSAS - 1930" at top none: 1 C 12345 10 C 1234 100 C 123 Coded by county of issuance ...
Embossed black serial on yellow plate with border line; "WN X-19" at left none: 123456 1 to approximately 114000 Revalidated through February 29, 1920, with white porcelain tabs. 1919–20 Black serial on yellow and white porcelain plate; "WN X-20" on white section at left none: 123456 144001 to approximately 157000, with gaps
Embossed black serial on yellow plate with border line; vertical "ND" and "1947" at left and right respectively none: 123-456 1 to approximately 152-000 1948 Embossed black serial on yellow plate with border line; "NORTH DAKOTA" centered at top; vertical "1948" at right none: 123-456 1 to approximately 162-000 First use of the full state name.
White on black porcelain; "DEL. 1909" at top 1234 1001 to approximately 1500 Serials followed on from those on pre-state-issued plates. 1910 Black on white porcelain; "DEL. 1910" at top 123 1 to approximately 900 1911 White on dark blue porcelain; "DEL. 1911" at top 1234 1 to approximately 1300 1912 White on maroon porcelain; "DEL. 1912" at top
Wedge prisms come in different colors such as clear or amber. The amber provides the same function as the clear wedge prism, only it reduces glare and is easier to use on overcast or cloudy days. Operating a wedge prism is one technique used in forestry today because the wedge prism is simple, relatively inexpensive, portable, and as accurate ...
First use of the full state name. Georgia: Embossed black numbers and border line on yellow plate; vertical "GA-27" as separator None 123-456 1 to about 265-000 On three digit plates "GA-27" appears at left. Guam: Flat black numbers on white plate; "Guam" and 1927 None 123 ? to ? Hawai'i
Embossed black serial on reflective white plate with border line; "MAINE 62" at top, offset to left, with metal tab slots either side of year "VACATIONLAND" centered at bottom 123-456: 1 to 384-000 Revalidated for 1963 with yellow tabs, for 1964 with dark blue tabs, for 1965 with red tabs, for 1966 with yellow tabs, and for 1967 with black tabs.