Hi, I want to know if you have any tips on bleach brow effect without actually bleaching the brows?

I have previously used a double ended mascara (white end, black end) and used the white end to coat the brows the used a mascara wand to brush through some cream foundation, this worked quite well, but wanted to know of any other methods.

no lie, ive seen MUAs smuge nude lipstick into the brows…
works quite well…

I would check out your theatrical supply store. They have tons of stuff for temp dying facial hair at the one near me. I don't use it for my work so I don't know what the specific names are.

I love to use a white cream eyeshadow, then use powder eyeshadow to colour them whatever shade I need.

MAC Brow set in "Girl Boy" or concealer

MAC Paint Pots

I use concealer but this wouldn't be effective on very dark brows. For very dark brows I would bleach to a medium brown and use concealer from there.

Real creations alcohol hair colors, skin ilustration hair colors are both great.  It is great to first neutralize the hair according to hair color and then highlight. A Dermacolor is also great for that.