Joined: Fri Jan 27, 2006 12:27 pm Posts: 764 Location: Western NY
One liquid that might be useful, but isn't on the list, is a commercial product called Refractol. It's used to check faceting rough for flaws. It has a RI of 1.567, and isn't toxic (that I can see from the label).
I just wish there was something without the toxicity so you wouldn't have to worry about inhalation or getting it on exposed skin, that had the RI we're looking for, but it doesn't look like I'm going to get my wish any time soon.
i have a question , reason for asking as I want to bring down my cost and avoid toxic substance if substitutes are available
Literature available online / in public domain gives formulation as under
1. Methylene Iodide or Di-iodomethane 2. Saturated with Sulpher 3. Tetraiodoethelene ( learnt that this is carcenogenic) or stannic iodide / tin iodide
Proportion of the above to arrive at 1.8 RI I want to know any liquid that is available with 1.8 RI or mixed to 1.8 RI ( Non toxic and easily available)
The RI of baby oil is like 1.46-47 Useless on a refractometer.
Unfortunately there is no substitute for the nasty halogenated liquids referred to above. If there was it would probably be equally nasty. (clove oil , cassia oil and cinnamon oil are really nasty and not worth having)
Some of the cheaper formulations lately, leave out the sulphur and the tetraiodoethane to make it cheaper. It costs a couple of units in the 0.01 place.
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