Suppose you wanted to perform this test on an unknown organism but you were out of PYR reagent. Suppose further that a fellow lab employee said that you could substitute formaldehyde for PYR reagent...

Suppose you wanted to perform this test on an unknown organism but you were out of PYR reagent. Suppose further that a fellow lab employee said that you could substitute formaldehyde for PYR reagent and get good results. Would you be tempted to believe him? Why or why not?