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Frankly, whether what he says is true or not, I would not expect any different response from a representative of Hogdon.
So, perhaps, we need a test. My thoughts are take a piece of bar stock so the steel is the same. Clean it good. Pour 15 grains of black in a spot on one end and light it. then repeat five times. Do the same on the other end with an equal volume of Pyroduh and place the piece of bar stock out in my pump house, so it is exposed to humidity but not weather. And photograph the results each day. We could even use a spot in the middle as a neutral to show the corrosion from just humidity on the steel.
See which, if any, produces the most evidence of corrosion.
Would that be scientific enough?
So, perhaps, we need a test. My thoughts are take a piece of bar stock so the steel is the same. Clean it good. Pour 15 grains of black in a spot on one end and light it. then repeat five times. Do the same on the other end with an equal volume of Pyroduh and place the piece of bar stock out in my pump house, so it is exposed to humidity but not weather. And photograph the results each day. We could even use a spot in the middle as a neutral to show the corrosion from just humidity on the steel.
See which, if any, produces the most evidence of corrosion.
Would that be scientific enough?