Stain on travertine (Fireworks)

[whowouldfigga]

I woke up this morning to a nice pink stain from a firework on my travertine. Must be from some smoke producing pyro.
Any suggestions on removing the stain from travertine.[attachment=0:26yr9v8f]DSC02727.JPG[/attachment:26yr9v8f]

 

[whoozer]

I'm not sure exactly but can you pressure wash travertine on a low setting? I know some rocks you can and some you cannot. I know some travertine is very brittle. I'm sure someone with more experience with it will chime in. Have you tried just hand scrubbing it with just water yet?