I second that. This should be one of those points of agreement that Chris says Dave should offer to his opponents. And also the analysis data of chips a-d - that's good and fine data: The photomicrographs, the XEDS spectra, the energy release...
That data strongly supports a conclusion of paint, quite specifically: LaClede standard primer, used by LaClede steel company on the floor trusses. That's a different manufacturer, and a different paint, from the columns. Harrit tested column primer, and yes, another agreement, these chips a-d are not column primer.
Ask Harrit if he found Iron Oxide. Yes, he will agree.
Ask him, if that iron oxide is specifically Fe2O3, and crystals of hematite. He should agree.
Ask him if he found about as much Silicon as Aluminium. He should agree with that.
Ask if he sees stacks of (possibly hexagonal) tiny platelike crystals.
Ask him if he is aware that there is a mineral called Kaolinite, which is an aluminium silicate that contains as much silicon as aluminium and appears, on microscopic scale, as stacks of pseudohexagonal platelike crystals. He shout either agree, or admit that he knows nothing about such minerals - which would disqualify him. If he agrees, ask if he is aware that Kaolinite is often used in paints. Ask him if the stacks of thin plates that he sees in his own micrographs match kaolinite. If not ask him which other crystal structure looks like that (elemental aluminium sure doesn't).
Ask if he found plenty of C. Well, he should agree, at least that there is an organic matrix.
Ask if he found traces of Chromium and Strontium. He should, because in his own whitepaper
WHY THE RED/GRAY CHIPS ARE NOT PRIMER PAINT he presents a
more detailed XEDS graph for chip a that has small peaks for Cr and Sr. He should agree to that - it's his own paper revealing that.
Now tell him what LaClede standard primer is, according to the specifications back in the late 60s:
- Pigment: 28.5% total, of which
- - 55% iron oxide (check - Harrit should have agreed to that)
- - 41% aluminium silicate (check - kaolinite seen, Al, Si detected in equal amounts)
- - 4% strontium chromate (check - small signal for Sr and Cr)
- Vehicle: 71.5% total, mainly epoxy amine, which is mainly C, O and H (check - Harrit admits to organic matrix)
This primer paint also explains the grey layer: It's simly oxidized iron. The stuff that primer gets painted on.
Ask Harrit if he has a different, better explanation for the grey layer.
Ask him if he has a different, better explanation for Silicon. (No, silicon is not typically used in nanothermitic composites; Tillotson, in the paper referemced by Harrit's Bentham paper, mentions addition of SiO only as something that lowers energy density and speed of reaction).
His fall-back will be the appearance of iron-rich microspheres after burn tests. Problem is: Iron is present in the gray layer from the beginning!
Oh, and yes, paint burns. Plausibly around 450°C.