William, if you have a black cane reed, it sounds like it would be a Rico PlasticCover. I’ve not used them in years – since the 90’s – but they were popular in marching band due to them playing louder, lasting longer, and not being as effected by the weather.
If they’re still the same, the back half of them is a regular cane reed color. But the vibrating part is all black due to the plastic covering.
Due to that covering, it didn’t make any deference when you soaked them. They’re kind of a hybrid of a can and synthetic reed.
Hope that helps or answers your question.