Oneplus 9r blue charging logo flash meaning. Normal charging is blue lightning, you use other chargers may be green lightning. So normal would be a blue lightning charge.
Black is because you are using slow charge, like 10 watts 5 watts are black, there is a green OPPO voo flash charge 20 watts 30 watts are, blue is 50 watts and 65 watts is this sign.
The top left corner shows two lightning symbols, which is fast charge