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Old 02-14-2006, 08:20 PM
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Doobiebro Doobiebro is offline
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Default Using STS For Sex Reversal

There has been one key change that I want to pass along to everyone

I have discovered that using a stronger concentration of STS does not make a plant more likely to produce pollen. It just burns/stresses the plant. What DOES make a plant much more likely to complete it's mission and make pollen is a second spraying at the end of week 2.

My conclusion is that STS in any concentration is only effective at inhibiting ethylene for about 3 weeks; at that point the plant's natural female metabolism begins to take back control, and even a plant that is covered with male blooms can't finish the journey to manhood and produce pollen. A second spraying allows inhibition to last through week 6, which is more than enough time to release pollen.

Some of you have decided to use stronger concentrations of STS. This is fine as long as it doesn't burn your plants. Obviously there is a wide range of usable formulas that will work. But the second spraying is the key to follow-through. You can store the working solution you used for round one (in the spray bottle) in your refrigerator for two weeks; no need to mix a new batch from stock.

I don't see the point of going any stronger than the formula I originally came up with. It has proven itself many times over. The only change I might make is to adjust it slightly to Gobgoober's "molar-correct" mix ratio. This is not at all necessary, but does allow the most effective use of the chemicals together.

Here's a re-post of the formula mix instructions, with the adjusted recipe below that:

Preparation of STS:
First, a stock solution is made. It consists of two parts (A and B) that are initially mixed separately, then blended together. Part A is ALWAYS mixed into part B while stirring rapidly. Use distilled water; tap water may cause precipitates to form.

Wear gloves while mixing and using these chemicals, and mix and use in a properly ventilated area. A mask will prevent the breathing of any dust, which is caustic. STS is colorless and odorless, and poses minimal health risks if used as described here. (See material safety data sheet links below). Note that silver nitrate and STS can cause brown stains upon drying, so spray over newspaper and avoid spilling.

Part A: .5 gram silver nitrate stirred into 500ml distilled water
Part B: 2.5 grams sodium thiosulfate (anhydrous) stirred into 500ml distilled water

The silver nitrate dissolves within 15 seconds. The sodium thiosulfate takes 30-45 seconds to dissolve.

The silver nitrate solution (A) is then mixed into the sodium thiosulfate solution (B) while stirring rapidly. The resulting blend is stock silver thiosulfate solution (STS).

This stock solution is then diluted at a ratio of 1:9 to make a working solution. For example, 100ml of stock STS is added to 900ml of distilled water. This is then sprayed on select female plants.

Both the stock STS and the working solution should be refrigerated after use, as well as the powdered chemicals, to avoid activity loss.

The Adjusted Formula is as Follows:
Part A: .7 gram silver nitrate stirred into 40ml distilled water
Part B: 2.6 grams sodium thiosulfate (anhydrous) stirred into 160 ml distilled water

Next, slowly add the silver nitrate solution to the sodium thiosulfate solution while stirring. This combination is then added to 800 ml of distilled water to equal 1 liter. This is your final stock solution. It is diluted 1:9 with more distilled water to make your final working solution, which then gets sprayed on your target plant.

Either formula will work great, so don't sweat it too much. But do that second spraying at the end of week 2... seems to be the key for getting pollen from the more difficult strains.

Source: Fet
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Old 11-21-2010, 06:13 AM
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Her is a link to the same idea, there is also a link at the bottom to source parts. 105$ makes 30 liters http://www.phytotechlab.com/pdf/STSSolution.pdf Karma, One Love
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Old 11-27-2010, 08:19 PM
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first off it STS better then CS????
i hear people claiming excellent results using CS and its easy to make especially if you have a dc battery charger and .999 silver coin. its non toxic easy to work with. and i guess its kinda the same when you spray it i think you spray twice.
me personally i never had luck with them, i like cuts or a nice f1 male to female cross. though my buddy has had good luck he had made some
Blue Buddha x Dire fem seeds he had some great plants from each seed all different but all fem and all great.
Fall last grow of 2011

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