Artexperience
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So after a couple days cleaning, replacing, making changes etc.........we may have come to the conclusion the contamination is coming from the vacuum to the porcelain oven. We see the black when we fire under vacuum, so far this is where I have stopped thinking. Has anyone heard of such a thing? Are the inside of hoses to the vacuum supposed to be cleaned? Wanted to put the thought and ? out there before the task of pulling the hoses off. If the contamination is coming from inside, where do we go next?