I want to do a milk bath shoot and I suggested to add food coloring to the milk for a trippy look. THANKFULLY the photographer noted that it may discolor my skin.

Forget my skin, I can't have rainbow hair!!!

Has anyone done this before? That colors are safe for me to soak in for an hr or two and still come out with the same blonde I have now?

Thanks!

I am not a hair specialist or colorist, but I can speak from personal experience. When my daughter was about 10, she had her hair waist length, natural mixed blonde hair sprayed at a children's fesitival with 'temporary' colour sprays. When we shampooed her hair that night, the really pale blonde strands turned green. I used a mixture of baking soda and shampoo and after several lathers and rinses, we managed to remove all the colour. I believe that blonde hair is often more porous so it grabs the colour more easily. I'd recommend you consult with a hair colour specialist in your salon who can examine the condition of your hair to determine if the colour will wash out after the shoot.

I'm a licensed Cosmetologist and this is a tough one...
It's definitely true that blonde hair can be exponentially more porous depending on how lightened they are and what their natural hair color level is (if they aren't totally natural) but a lot of the risk with staining comes simply from how light the hair's surface is. You can reduce the amount of color that your hair would absorb by applying a thick conditioner or masque beforehand to act as a buffer against the food coloring and staining but I'd be quite careful even then. The conditioner will provide a physical barrier and your hair will absorb more of it than the surrounding liquid which will keep it from wanting to take in the food coloring. It will steadily wash out of the hair the longer it is submerged though. Hmm...

Doubting over an hour with the coloring. It'll be mixing too much. Probably more like 20-30 minutes tops.

To address a comment in the other thread, it will be malted milk flakes.

We had a suggestion to use acrylic paints, but I do not want to be scrubbing a hotel bathtub or paying them for damages. I can see the acrylics not staining her hair, but it could make a mess that is difficult to clean out in time for her next shoot.

What about bath bombs?  Lush makes some that turn the water fun colors.  Crayola also makes some for children.

And acrylic paint....just no.  Never.  Not on a model's skin.

Echo the NO to craft or non-toxic paints.
The skin exposure will be all-encompassing and a long duration.

Thanks for the tips guys!