How do you cover up your gray hair?

I have scattered gray hairs, so it’s a bit awkward to dye them.

I tried dyeing my hair, but my scalp is itchy and it seems like I'm getting more gray hair after dyeing. Is it just me?

Gray hair cover

There are things like mascara, too,

There are also spray-like ones,

There was also one that you could apply.

Which one is better?