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@MMSC16, Super easy to make silver thiosulfate (STS). The first link is the basis for the cooking instructions. I've done some algebra for you in the 2nd link for a smaller batch and no excess of either 'mixing' solution. It's good to aim for 3mM due to error in scales likely used. If you have more resolved scales, you can do smaller batches. The second link is a recipe that pushes a .01g +/-.03g scale to a 10% error rate, and it STILL makes 667mL (3mM) of STS, which is still a lot more than you'll use in most cases. Lots of waste if '1' plant, but still 10-50x cheaper than buying this from some marijuana branded company. The "Twenty20" brand STS sent out old expired solutions and price-gouged at an insane rate. They gave barely enough for 1 plant at the cost of 5 gallons of this recipe, lol, and clearly didn't understand the chemistry as they sent out a bunch of defective product with a known experiation date. Ingredients -Silver nitrate can be found on ebay for 2 USD per gram, as of couple years ago. This will not be a professionally packaged and labeled product, so read reviews to ensure the guy is reputable. -Anhydrous sodium thiosulfate is probably best bought on ebay too. that will be a professionally labeled and packaged product. It'll be as small as a 4oz/113g bottle and should be less than 10 USD. That's enough sodium thiosulfate for 20 grams of silver nitrate. If you follow my instructions, it's .34g of silver nitrate per 667mL batch of STS. You need a scale that resolves .001g to make smaller batches. -Get one of those aerosolizing spray bottles vs a typicl squeeze-spray. These you squeeze what amounts to be a pump and as the pressure rises it emits a very fine mist that will cover leaves more effectively and not waste as much of the solution. Opaque black is key. Light is a real enemey, here. You'll quickly ruin a mixed solution if exposed to light. Store in dark, cold space, like a fridge. Wrap it in aluminum or otherise completely dark. Seal it, as you don't want this shit near food, lol. Maybe a zip lock bag, too, lol. https://www.sigmaaldrich.com/US/en/technical-documents/protocol/cell-culture-and-cell-culture-analysis/plant-tissue-culture/silver-thiosulfate https://postimg.cc/mht76Vc4 -- image link good for 1 week from this date, so save it to your computer or phone.