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3 votes
3 votes
How can the hair growth rate be used to determine how long ago an individual dyed their hair?

User Beshoy
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2 Answers

20 votes
20 votes

Answer:

Hair grows 1cm each month, so take how many centimeter's the dyed hair is from the root and however cm's that is equals how many months ago someone dyed their hair.

Step-by-step explanation:

Example: the dye begins 6cm from the root. 1cm = 1 month so that means that it has been 6 months since the individual dyed their hair.

User Smolinari
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2.9k points
16 votes
16 votes
The length of the undyed portions can tell how long ago a hair sample was dyed.
User Srinath Mandava
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3.1k points