<P> Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5--8.3 at 25 ° C (77 ° F). Neutral litmus paper is purple . Litmus can also be prepared as an aqueous solution that functions similarly . Under acidic conditions, the solution is red, and under basic conditions, the solution is blue . </P> <Table> <Tr> <Td_colspan="3"> Litmus (pH indicator) </Td> </Tr> <Tr> <Td> below pH 4.5 </Td> <Td> </Td> <Td> above pH 8.3 </Td> </Tr> <Tr> <Td> 4.5 </Td> <Td> ⇌ </Td> <Td> 8.3 </Td> </Tr> </Table> <Tr> <Td_colspan="3"> Litmus (pH indicator) </Td> </Tr> <Tr> <Td> below pH 4.5 </Td> <Td> </Td> <Td> above pH 8.3 </Td> </Tr>

What color does red litmus paper turn in a neutral solution