Black Tee Shirt

What is the most effective way to diminish a black T-shirt (FTL)?
What is the most effective way of reducing a T-shirt with a logo on it? I would like to reserve as much as possible of my color. Thank you! The shirt is 100% cotton, FYI. And I would shrink 1/2-1 size, if possible. Keep in mind, the shirt has a logo ON IT!
Soak in warm water, then wash with warm water, dry at high temperature to preserve the good cheer detergent use color as color safe
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