An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Hard headed
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someone who wont change theyre mind easily. somone who has not reasoning. A person who once they have their mind set on somthing it isnt easily changed without and arguement.
Hard headed meaning & definition 1 of Hard headed.
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stupid or ignorant person that wont listen
Hard headed meaning & definition 2 of Hard headed.
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1.Dont listen to what anybody tells you to do
- Have a really hard head
Hard headed meaning & definition 3 of Hard headed.
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Realistic and down to earth.
Hard headed meaning & definition 4 of Hard headed.
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