अदेबानि, फाखि होग्राफोरा सोलो गोनां जाबाय आरो दा खेमिकेलफोरखौ बाहायला, बे जाहोनावनो रेबगना फुलप्रूफ नङा।
However, fraudsters have gotten wise and no longer use the chemicals, so the pen isnâ€™t foolproof.