[ForgetRegret]

Here's the TFSI ingredients

Shadow Insurance Ingredients: Isododecane,Talc, Cyclopentasiloxane, Disteardimonium Hectorite, Trimethylsiloxysilicate, Glyceryl Triethylhexanoate, Polyethylene, Trihydroxystearin, Sorbitan Sesquioleate, Isopropyl Lanolate, VP/Eicosene Copolymer, Propylene Carbonate, Dimethicone, PEG-40 Stearate, Phenoxyethanol, Tocopherol. (+/-): Mica, Bismuth Oxychloride (CI 77163), Titanium Dioxide (CI 77891), Iron Oxides (CI 77491, CI 77492, CI 77499). Net Weight: 11 g/ 0.35 Oz

and the UDPP ingredients

Ingredients:
Isododecane, Talc, Cyclopentasiloxane, Disteardimonium Hectorite, Trihydroxystearin, Triethylhexanoin, Isopropyl Lanolate, Sorbitan Sesquioleate, VP/Eicosene Copolymer, Dimethicone, PEG-40 Stearate, Propylene Carbonate, Phenoxyethanol, Cera Alba (Synthetic Beeswax), Trimethylsiloxysilicate, Propylparaben, Methylparaben, Ethylparaben, Butylparaben, Methicone, Isobutylparaben

May Contain:
Mica, CI 77891 (Titanium Dioxide), CI 77491, CI 77492, CI 77499 (Iron Oxides), CI 77163 (Bismuth Oxychloride)

I've highlighted the ingredients that the two products share in red...if your eyes don't react to TFSI, but they do to UDPP, it would probably be something in UDPP that TFSI doesn't have, or that the UDPP contains more of something (the closer to the beginning of the list, the more of that ingredient is in the product) than TFSI, which is irritating to your eyes.

...although I just read the MSDS for Bismuth Oxychloride, and it seems that it's a known potential skin irratant. http://www.sciencelab.com/xMSDS-Bism...loride-9923103 check the MSDS for yourself. It's entirely possible that because it's listed as "may contain" in both products, it may be present in some batches, but not in others, or the more likely scenario, it's present in higher quantities in some batches of the product, a quantity which may be extremely irritating to your eyes. I've personally been using UDPP for a few years, and have never had an eye irritation problem, I'd be very curious to see if those of you who've had issues may have products from the same batch or not...

Ok...I'm done being a nerd now...sorry...

HTH a little...