Paul, with regard to your experiment, certainly, we can be confident that the 'before' and 'after' mass is identical. We know that, in normal terrestial conditions, processes that convert mass to energy don't occur naturally except in radioactive decay. If they did, none of us would be here to witness it. Such experiments as you describe are not news, and are totally irrelevant to mass/energy conversion in nuclear reactions, such as in a fission power station, or the fusion processes of a star.

Paul: "as for the fission equations you replied with it is my personal opinion that the energy did not come from the matter, it was converted into another form , perhaps one that you dont know about yet , or cannot see."

So, Paul, it's your opinion. Fine. But if you intend to refute established science, and want to avoid dogmatism, you need to come up with a better argument than a personal 'feeling' that it must be wrong.

I'm listening. Go ahead.
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"Time is what prevents everything from happening at once" - John Wheeler