Tips to remove blood stains in the karategi either because of tough competition or strong training, injuries or friction can occur therefore causing slight bleeding.
When the blood stain is Immediate, the sooner the care is givien to your gi, the quicker this stain can be removed.
Immediately wash with cold water. Plenty of very cold water or ice should life the stain off the material.
You can also wash with a little bit of salt. The salt can dilute the enzymes in the blood so that when washing the karategi it can come out a little more easily.
If there is some oxygenated water around your dojo, it can be used on the spot especially if they are small spots. You should try to apply just where the stain is and leave it for about 5 minutes, then clean away with cold water.
When the blood stain is Dry, toothpaste is a good option by placing a little in the area of the stain, let dry and then remove with plenty of cold water, if the stain takes a long time may be necessary to repeat the process about 2 or 3 times.