Question

Chemical messages known as ______________ have been linked to criminal activity.

Chemical messages known as ______________ have been linked to criminal activity.

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Answer #1

invisble ink message

about message: in this kind of message, few text coded with invisble ink on paper which can not be seen for naked eye. it's just blank page. After some treatment like giving heat, uv-light, acid-base reaction message seen preperly which is used for criminal activity.

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