linked - Investigating the Terror

velocity of detonation are just a tad on either side of that
parameter of detonation.
Williams further testified that he was able to rule out quite a bit of the
slurries, water gels and emulsions because of the failure to find
microballoons or tipper ties among the debris at the scene. Williams
testified that microballoons are tiny glass balloons that are included in
some emulsions to add air space, and tipper ties are the wire ends of
water gels. He testified that he would have expected to find microballoons
if the explosive at the Trade Center had been an emulsion and find tipper
ties if it had been a water gel. He then concluded by identifying urea
nitrate as within the category of a fertilizer-based explosive that would
have that velocity of detonation consistent with the damage that [he] saw.
On cross-examination, one of the defense counsel (Mr. Campriello)
attempted to recapitulate Williams' earlier testimony but misstated it,
leading to the following:
Q. . . . In other words, you said that this was basically a bomb, if
I understand, made of urea nitrate and this substance and that
substance.
MR. ABDELLAH [another defense counsel]: Objection. That's not
what he said.
THE COURT: I think he's -- I don't think you're limiting yourself.
Is that what you're saying? You think?
MR. CAMPRIELLO: That's all I'm saying.
THE COURT: Go ahead.
A. Yes I do. I believe urea nitrate was the bulk of the constituent
in that bomb with other explosive materials; yes.