Answer :
Final answer:
None of the listed numbers in the Wella numbering system (1/0, 5/0, 7/0, 10/0) represent a red violet tone. In this system, a red tone is indicated by the secondary number 4, and a violet tone by 6 or 7, which are not present in the options provided.
Explanation:
The question is related to the Wella color numbering system, widely used in hair coloring techniques in the beauty industry. Within this system, hair colors are categorized by a number that represents the depth from black (1) to lightest blonde (10), followed by a slash and a second number that indicates the color tone. When choosing a red violet tone, one should look for a number that represents both red and violet tones. Number 3/0 is simply a dark brown and does not reflect red violet tones. In the Wella numbering system, numbers with a secondary number including 4 (for example, 5/4 or 6/4) would suggest a red tone, and 6 or 7 would suggest a violet tone. Since the options provided do not include these, none of the numbers listed (1/0, 5/0, 7/0, 10/0) would accurately represent a red violet tone. They would represent black, light brown, medium blonde, and lightest blonde, respectively, with no tone indication.
