Yes, there is. Methanol and ethanol are very chemically similar and small amounts of methanol in your ethanol is usually acceptable from a chemical standpoint. But denatonium benzoate is not like ethanol, and can be a contaminant that destroys the process.
To get around this, you either have to find old-fashioned methylated spirits in very high purity, pay the alcohol taxes (which are stratospheric on 200 proof...), or file a crapton of paperwork to buy ethanol tax-free because you're doing chemistry things with it, not drinking it. The latter is what big operations do, but it's a giant pain in the ass if you are not a big operation and you just need moderate volumes of high purity alcohol for your critical cleaning operations....
Yes, there is. Methanol and ethanol are very chemically similar and small amounts of methanol in your ethanol is usually acceptable from a chemical standpoint. But denatonium benzoate is not like ethanol, and can be a contaminant that destroys the process.
To get around this, you either have to find old-fashioned methylated spirits in very high purity, pay the alcohol taxes (which are stratospheric on 200 proof...), or file a crapton of paperwork to buy ethanol tax-free because you're doing chemistry things with it, not drinking it. The latter is what big operations do, but it's a giant pain in the ass if you are not a big operation and you just need moderate volumes of high purity alcohol for your critical cleaning operations....