https://archive.is/JUevh https://archive.is/JUevh (Long may it live) As to the grout accelerant in question: TDS [PDF]: https://assets.ctfassets.net/ctspkgm1

https://archive.is/JUevh https://archive.is/JUevh (Long may it live) As to the grout accelerant in question: TDS [PDF]: https://assets.ctfassets.net/ctspkgm1yw3s/DMSY-1685695220-3913/f0dbe116ae8932c06c72bb48735b7c35/masterroc-aga-41s-tds.pdf https://assets.ctfassets.net/ctspkgm1yw3s/DMSY-1685695220-39... MSDS [PDF]: https://assets.ctfassets.net/ctspkgm1yw3s/3Tp3imoxG5XfZlrlzURb1f/f0c8bc4d92df08bd73c2774f6a31b698/MasterRoc-AGA-41S-sds_en_us.pdf https://assets.ctfassets.net/ctspkgm1yw3s/3Tp3imoxG5XfZlrlzU... I am not skilled in the arts of aggregate curing and occupational exposure, but I wonder if it’s the “silicic acid” or a non-table-variety of “sodium salt” (from the MSDS) that’s sloughing the firefighters’ skin off here… or something that happens when the sodium oxide (from the TDS) hits water? Chemistry class was a lifetime ago but does that turn it back into lye? Is the oxide technically a “sodium salt”?