For the source text click/tap here: Zevachim 93
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As we learned on yesterday’s daf if sacrificial blood is absorbed by another object, the laws pertaining to the sacrifice are transferred to the object unless the blood is removed. Therefore, clothing that was stained by blood had to be washed in the Temple courtyard, metal vessels that absorbed blood could be heated until the blood is removed, but earthenware vessels, which retain anything that they absorb, must be destroyed.
The Mishnayot on our daf offer a number of limitations to that rule –
First, this law does not apply to all sacrificial blood; it is limited to blood that was collected by a kohen in a keli sharet – in the appropriate Temple service vessel – and is valid for sprinkling on the altar. Therefore, if the blood was sprayed directly from the neck of the animal, or if the clothing came directly in contact with blood after the blood had already been applied to the altar, there would be no need to wash it out.