How many types of skin color are there?
No context provided
How many types of skin color are there according to the Fitzpatrick scale?
6 VI six
No context provided
How many types of skin color are there according to the von Luschan scale?
36
Human skin color
https://en.wikipedia.org/wiki/Human%20skin%20color
The von Luschan scale was used to establish racial classifications of populations according to skin color; in this respect it is in contrast to the Fitzpatrick scale intended for the classification of the skin type of individuals introduced in 1975 by Harvard dermatologist Thomas B. Fitzpatrick to describe sun tanning behavior.[
Von Luschan's chromatic scale
It was developed in 1975 by American dermatologist Thomas B. Fitzpatrick as a way to estimate the response of different types of skin to ultraviolet (UV) light.
Fitzpatrick scale
American dermatologist Thomas B. Fitzpatrick developed the Fitzpatrick scale as a way to estimate the response of different types of skin to ultraviolet (UV) light. It consists of six categories. While the Fitzpatrick scale is used to  describe sun tanning behavior, the von Luschan scale was used to establish racial classifications.  It contained 36 categories.