Is there a black and white filter that darkens yellow, specifically blonde hair?

[RobC]

get a different model

 

[cmacd123]

Manic Panic.

Dead Link Removed

temporary colour in a wide number of shades.

 

[RobC]

Blue/cyan, but I'm not sure how great that makes her skin look.

The effects of different filters on colours in black and white

http://www.photographymad.com/pages/view/using-coloured-filters-in-black-and-white-photography

From that link:

A blue filter darkens most colours and is used to reduce contrast

 

[alanrockwood]

Temporary hair dye? ...

My thought as well.

Alternatively, is there a way to use the similarity between her hair color and her skin in a creative way to enhance the photo?

 

[ColColt]

I can't say how it would actually work on a live model but I've copied old family photos from the turn of the century((1900) that were fading out and a light yellow color. Using a blue filter(80A) brought a nice looking negative, brought back what looked to be nearly gone, and the contrast was evident in the negative and hence, the print.