How to know the difference between an original and a fake Naira note

Naira is the Nigerian currency, currency used in Nigeria. The Nigerian currency, Naira are in different forms ranging from coins to notes. In coins, we have 50kobo, 1naira and two naira and the notes of various denominations include N5 (five naira) to N1000 (one thousand naira) that is: N5 (Five Naira), N10 (Ten Naira), N20 (Twenty Naira), N50 (Fifty Naira), N100 (One hundred Naira), N200 (Two hundred Naira) N5 (Five hundred Naira) and N1000 (One thousand Naira).
Due to corruption in the country, people tend to print and make use of counterfeits of this currency. The fake naira note is similar to the original note as it contains almost all the contents of the
original. Despite the fact that the fake looks exactly like the original, there are some properties that can differentiate between the two, these properties include: thickness of the note, color of the note, etc. The original naira note is thicker than the fake, the color of the fake naira note is lighter than the original as the later is richer and thicker in color. Some times these factor can not give exact differentiation between them because as the note gets old it gets weak as both the color and thickness are reduced. The best among all methods is the one I call CBN LINE FACTOR. This is a line with CBN written on it multiple times. It  is seen as a broken line (in front in N100, N200, and N500 but  at the back for N1000)

 but it is actually a straight line when u flash a white light from the opposite side of the note.

 I still call this method the best because it works for both old and new naira and unlike the color test that you need to have both the original and the fake before you can differentiate, with one note you can always tell if it is fake or original. We have other ways of determining wether a naira note is fake or original like the faded sketch of the image on the blank part, folding the note and leting it to unfold a little etc.
The fake Naira notes are normally found in N100, N200, N500 and N1000 but mostly in N500 and N1000.
Note: If the note is old, the CBN LINE tend to detach a little and you can touch and feel it (the nylon-like line) from its edges but can never be found in a fake note.
Watch the video below to see all differences between the Fake and original Naira note.

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5 Naira (1984) (Alhaji Abubakar Tafawa Balewa; dancers)
10 Naira (1984-) (Alvan Ikoku; Nigerian women)
20 Naira 2001 (General Murtala R. Muhammed; arms)
50 Naira (1991-) (citizens, farmers)
100 Naira 1999 (Chief Awolowo; Zuma Rock in Niger!)
200 Naira 2000 (Sir Ahmadu Bello; cows; agro produce)
500 Naira 2002 (Dr. Nnamdi Azikiwe; oil platform)
1000 Naira 2010 (A.A. Mai-Bornu; Dr. C. Isong; CBN in Abuja)