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Hydrangea plant's petals change to which colour on the addition of acids?

Hydrangea plant's petals change to which colour on the addition of acids?
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Hydrangea plant's petals change to which colour on the addition of acids?

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User Iamsar
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If it's a pH below six it's blue, if it's a pH between 6 and 7 then it would be purple, if it's above 7 it would be pink or red
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User Ladislav Zitka
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