IHT-1600-WHT - 11oz Cotton Knit Crew Neck Short Sleeved T-Shirt - White
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I managed to get rid of the stains on my shirt. I did 3 overnight soaks in oxygen bleach followed by 3 washes on a medium cycle at 40 degrees. This removed about 90% of the yellow stains. However, the blue stains in the armpits were still there because the oxygen bleach was not strong enough to break down the indigo.
I then soaked the shirt for 15 minutes at 60 degrees in sodium hydrosulfite, which partially reduced the indigo by removing oxygen and turned the stains pink. If it indigo was fully reduced, the stains would have turned yellow. I then rinsed the shirt to remove the sodium hydrosulfite. If I had let the shirt dry, the indigo would have slowly oxidized and return to blue. Instead, I put it back into a bucket of oxygen bleach. Even though oxygen bleach performs the opposite chemical reaction as sodium hydrosulfite, the oxidation was quick enough that it was able to break down the indigo in its weakened state so the stains were removed instead of turning blue again.
I then washed the shirt with a hard wash at 60 degrees. Afterwards, the yellow stains were invisible and the indigo stains very faint.
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@will6er It is tiny indeed.
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@will6er It’s a medium. I didn’t measure before and after washing but I didn’t notice and drastic shrinkage.
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@DrPat Is your scientific technique why you're a Dr?
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@indigostiff Yea, but it's in physics and not chemistry.
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Sick t-shirts. That’s my summary. I love them.
I have heavy-knit tees from Dehen and Sunray, but the Iron Heart ones are my absolute favorites. I'd put the Real McCoy's basic tees as a close second.
I own them in black, olive, cream, and white, and they’re ideal for spring and autumn. Unfortunately, they’re just too heavy for hot weather.
For reference, I'm 176 cm (5'9") and 84 kg (185 lbs). I wear a size L.
The sizing chart can now be found in the first post. 
