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underground posted a topic in Grow Journals IndoorMaking your own STS feminization mixture for a few bucks You need: Silver nitrate - AgNO3 (only expensive part of STS) – can be found on ebay or chem shop, cost is about 30$/10g - 10g will last for 12l of foliar spray!!! Sodium Thiosulfate or Sodium thiosulfate pentahydrate - Na2S2O3 or Na2S2O3-5H2O - can be found on ebay or chem shop. Distilled or RO water, kitchen or medical gloves, syringes, plastic bottles. Mixture A Take your scale – you need 1.7g of AgNO3 – use gloves and be carefull cause AgNO3 will leave dark black marks almost impossible to clean on your skin. But don't worry - they will stay for a few months – new skin new look Add 1.7g of AgNO3 to 100ml of distilled water. Dont use any metal objects – only plastic or glass! This is mixture A – it should be put in dark place [no direct light!] or in the dark plastic bottle. Mixture B 6.32g of Na2S2O3 or 9.92g of Na2S2O3-5H2O - add it to 400ml of water. It doesnt have to be distilled water but it is better to use it. You can add 6.3 or 9.9 if you have 0,0 scale. This is mixture B. You dont have to protect it from light. Mixture A and mixture B can be stored for a long time in a dark place. Mixture STS Now we can make STS: you take 5ml of mixture A and 20 ml of mixture B – slowly stiring you add A to B and have mixture STS. STS is not as stable as mixture A and B alone and should be use as fast as possible. It is better to make amonut of STS you use in one foliar spraying. Now we have STS so we can use 1:2, 1:3 or 1:4 concentration. It means you add your mixed STS to water. Concentration means: 1:2 – 1 part STS 2 parts water [25ml STS + 50ml water], 1:3 [25ml STS + 75ml water] etc. Now you can use this mixture for foliar spraying. It is best to start from 1:3 concentration – if nothing happens you can use stronger concentrations. All depends on experience, strain and other factors. Some strains are easy to herm – some not. It is best to use STS as soon as flowering starts. Male bananas popping from female flowers will give you feminized pollen! Peace brothers!