Typically, the specimen isn’t in formaldehyde, but it’s first “fixed” in formaldehyde (it chemically reacts to stop decomposition) and then placed in ethanol or isopropanol. Per this [NPS document](https://www.nps.gov/museum/publications/conserveogram/11-03.pdf), the yellowing is mainly due to dissolved proteins and lipids.
Typically, the specimen isn’t in formaldehyde, but it’s first “fixed” in formaldehyde (it chemically reacts to stop decomposition) and then placed in ethanol or isopropanol. Per this [NPS document](https://www.nps.gov/museum/publications/conserveogram/11-03.pdf), the yellowing is mainly due to dissolved proteins and lipids.
Typically, the specimen isn’t in formaldehyde, but it’s first “fixed” in formaldehyde (it chemically reacts to stop decomposition) and then placed in ethanol or isopropanol. Per this [NPS document](https://www.nps.gov/museum/publications/conserveogram/11-03.pdf), the yellowing is mainly due to dissolved proteins and lipids.
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