# Is SlowFade Glass supposed to look brown?

**URL:** <https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557>\
**Category:** Probes & Prep\
**Created:** [May 31, 2024, 3:46pm UTC](https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557 "2024-05-31T15:46:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![JelleP](https://avatars.discourse-cdn.com/v4/letter/j/258eb7/32.png) [@JelleP](https://forum.microlist.org/u/JelleP)\
**Post date:** [May 31, 2024, 3:46pm UTC](https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557/1 "2024-05-31T15:46:47Z")

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Hi all,

I’ve decided to give SlowFade a try.

A couple weeks ago I purchased a bottle, and mistakenly stored it above the recommended temperature (4 degrees, instead of \< -5 degrees…)

Upon the first time opening it (today), the liquid looks brown colored.

Does anyone with experience using SlowFade Glass know if this is supposed to be brown before mounting? I would expect it completely transparent, considering the application…

Many thanks in advance.

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**Author:** ![jennifer](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.microlist.org/jennifer/32/634_2.png) [@jennifer](https://forum.microlist.org/u/jennifer)\
**Post date:** [June 4, 2024, 5:50pm UTC](https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557/2 "2024-06-04T17:50:00Z")

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Hi! Many anti-photobleaching reagents include phenylenediamine, which can turn brown over time. It’s usually ok for a while but I’d recommend you look at one of your samples before mounting it, and again after, to be sure.

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**Author:** ![JelleP](https://avatars.discourse-cdn.com/v4/letter/j/258eb7/32.png) [@JelleP](https://forum.microlist.org/u/JelleP)\
**Post date:** [June 5, 2024, 10:00am UTC](https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557/3 "2024-06-05T10:00:38Z")

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Thanks Jennifer, I’ll not throw it in the trash just yet!

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**Author:** ![JamesOrth](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.microlist.org/jamesorth/32/153_2.png) [@JamesOrth](https://forum.microlist.org/u/JamesOrth)\
**Post date:** [June 8, 2024, 3:07am UTC](https://forum.microlist.org/t/is-slowfade-glass-supposed-to-look-brown/2557/4 "2024-06-08T03:07:23Z")

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Agree with Jennifer, I;ve used plenty off mounting agents that have a color of brownish-red and they were ok, but keep your eye on it. I always felt like this was more common when the reagent was a bit older or had seen a few cool-warm cycles, but that it just a ‘feeling’.