Where’s some good places to buy silver nitrate and sodium thiosulfate to make STS spray?
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Welcome to OG. 
if you’re in the US, you can just google “silver nitrate” for sale. Lots of chemical/science sites sell it.
In Canada a little harder to come by, but you can bring it in from the states. Or try eBay or Etsy.
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In the US , Yeah I know, i guess i was asking if there’s preferred suppliers or the cheapest, or fastest etc
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I’ve had good luck with getting silver nitrate and sodium thiosulfate on ebay. It was the easiest way to get small quantities and get free shipping. It doesn’t take much to make a big batch of STS.
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Also what grade of silver nitrate is best to use?
Ideally 99.9% lab grade pure silver. 
Or Lab Grade Silver Nitrate (OgNO₃)
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I second this. I found a random supplier for my silver nitrate on eBay. For sodium thiosulfate, I went through the chemical supplier, Loudwolf on eBay
If you want preparation instructions, feel free to DM me. I prepare a 3mM solution and follow this schedule: https://twenty20mendocino.com/sts/
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I got my Sodium Thiosulfate and Silver Nitrate anhydrous from Home Science Tools .com.
And I made using this method
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Will be watching this project and following along!
