@Sebring, I think it may be sativa related. The last time I grew out sativa was Neville’s haze. The buds looked the same with them. However, it could be they require much more light than the indica type plants.
It is also very hot in there. Even though the Flowering room is in the basement, it hits 93° a couple of times a week since the weather heated up. I have six high velocity fans blowing hot air out the door. Until I can afford to get a new central air unit, it is difficult getting cool air back in the room.
I literally spent days on this. When looking up online how to mix I found 8 different recipes.
I made a spreadsheet to tell me how many grams per liter there were of each chemical in each recipe. These recipes all ended up with very different grams per liter of each. The only posted recipes I found that agreed with another posting, was a word for word re-post of one of the recipes already in my list.
I got tired of trying to make sense of it, so I went where they’d. I visited the chemical companies that showed up in my search. There was no disagreement between them. The hardest part here was having to look up terms and words that are part of the chemistry world.
It turns out the mix @ReikoX is using for STS is mathematically correct.
The formula you posted is the most commonly re-posted of all the STS recipes. But, that does NOT make it correct. It looks like the original poster decided to save money by skimping on the silver nitrate, but reducing just that and not the thiosulfate, leaves extra sodium thiosulfate molecules in the solution. I see this as bad. That chemical is used in developing photographs. It is used to absorb any excess silver in the developing solution to prevent the images getting too dark. Seems to me the STS molecules would look like free silver molecules to the sodium thiosulfate, thereby diluting the solution even more. For any form of that formula to be correct, It would needed to be amended more like this:
For true silver thiosulfate, you mix it at a 1:4 molarity. A mole represents the weight of the molecules in the solution. One mole, I believe, is the grams per liter. The following information calls this “Molar Mass”. It is the weight you use when reducing the solution by a percentage.
Name: Silver Nitrate
Formula: AgNO3
Molar Mass: 169.8731
Name: Sodium Thiosulfate (Sodium Thiosulfate Pentahydrate)
Formula: Na2S2O3 (Na2S2O3.5H2O)
Molar Mass: 158.1077 (248.1841)
Name: Silver Thiosulfate
Formula: Ag2S2O3
Molar Mass: 327.8646
According to 3 the chemical company sites, the correct mixture for 1% silver thiosulfate solution would be:
1 part silver nitrate solution at 1.698731 grams per liter added to
4 parts sodium thiosulfate solution at 1.581077 grams per liter. (2.481841 per liter if using pentahydrate)
This, of course, gets diluted so we don’t kill our favorite green things. Common wisdom indicates using .1% solution
It doesn’t matter if you reduce the amount as long as both are reduced by the same amount same percentage
The difference between the anhydrous and pentahydrate sodium thiosulfate is pentahydrate has five H2O molecules bound with it to make it a crystal form. Once dissolved in water, the molar weight it the same as anhydrous since the water molecules strip away as soon as they hit the water.
There is one thing left out on all the STS mixing instructions from how the experts mix. They do all there mixing in a darkened cabinet because both solutions are reactive with light. Small wonder that STS is so sensitive to light, eh?
These application instructions, and others are where I learned the instructions that came with my purchased STS were very lacking.
I’m glad I did all the research. I actually understand the process now. I did re-spray my sweet tooth #4 fem. Having an adequate supply of STS to spray until runoff should get it right. I should have chosen just a branch to spray, but the plant was pretty small when I started. I’m sure the male buds that are on the plant now will eventually open but they are so deeply buried inside the female flowers that are continuing to grow that I might not see it, so I need the plant to make more.