...after a little bit of research and more than a bit of suspicion with a hint of
'it's still good right?' I came across this
snip from
Sodium Metasilicate
Review of Toxicological Literature
Human Data
On intact and abraded skin, sodium metasilicate (37%) in a detergent with sodium carbonate (50% w/v
aqueous) was a severe irritant. In modified soap chamber tests, sodium metasilicate had no adverse
effects (i.e., erythema and edema scores were low). In elbow crease tests and semi-occluded patch tests,
mild and temporary irritation was observed with sodium metasilicate. Ingestion of 0.5 L of colloidal
sodium metasilicate resulted in the death of an individual within one to 1.5 hours. Autopsy revealed
alkali burns in the gastric mucosa and condensed waterglass in the stomach, while microscopic
examination showed amorphous sodium metasilicate in the bronchioles and alveoli of the lungs.
from
HERE
sigh.. had better go and bin it..
brew day over.