I just found this sub and I'm so glad I did!

I recently won a Xerographica and it arrived in the mail a couple of weeks ago. Per the instructions on the seller's site, I soaked it for about an hour (we have a fish tank, so I use that water because I've heard it's great for airplants), and shook it out. It came with a bottle of fertilizer so I misted it with that and then I turned it over to dry.

When I went to mist it again with just water a couple of days ago, I noticed that it has some coloration on the edges.. It's a bit hard to see in the photo but I'm having a hard time telling whether it's normal or not.

I've been keeping it in a north-facing window where the light is bright, but also blocked by neighboring apartment buildings.

Is it brown and something's wrong? Or is it pink and just the natural coloring (I know they can have blushed coloring)?

Thanks!