Learn how to mix up some Silver Thiosulfate. It's more consistent than CS and you only have to spray 3x 5 days apart.
Search: "Sigma aldritch STS tissue culture procedure"
or, follow the link:
https://www.sigmaaldrich.com/US/en/technical-documents/protocol/cell-culture-and-cell-culture-analysis/plant-tissue-culture/silver-thiosulfate
This needs to be diluted 1:9 or 1:5.67 to get down to 2-3 mM/L concentration (millimoles). While you can change scale of the above recipe, do follow it to the tee.
e.g. i just weighted out a 10mL / 40mL version.. .17g of silver nitrate and .632 grams of sodium thiosulfate. You'll want a "milligram" scale to mix up anything less than 1L of STS. Even 500mL with the standard .01g reso / +/-.03g will be 10% off due to scale error.
The chemicals are cheap on ebay. Fully dissolve, then slowly mix one into the other. it's easy as pie. If you waste a bit, that's okay as it's cheap AF. Don't overpay for the branded STS out there. they are notorious for not adhering to experiation dates. The individual solutions before mixed can last 6 months in a dark fridge. The mixed STS should be used within 30 days, but anecdotally it does work longer than that. The dry chemicals will last decades on a shelf, in a cool, dry place. Mix up as needed. Bet 10 USD of silver (~5 grams) nitrate lasts you years. that's 25 batches of 500mL of STS.
Don't use metal utensils or metal of any kind in the process. The silver nitrate is highly corrosive. It will stain things permenantly too. So, don't do this on your kitchen table, lol, or put down some plastic/papertowel to keep it clean.
Don't buy the "500 ppm Collodial Silver" stuff. It's usually not 500ppm and contains very little 'silver.' If you want to go this route, look up how to make your own with a silver coin, a battery and some water. But, this shit you have to spray every day for 2 weeks? Also, making a less precise concentration - a bit of a guess each time. Meh to that. 1/day 5 days apart is much easier and like i said the STS is more effective anyway.