
Blue mushrooms, or magic mushrooms, are fungi that produce the psychotropic compounds psilocybin and psilocin. The blue colour is caused by a reaction between psilocybin and oxygen, which creates a complex mixture of linked psilocybin oxidation products, most of which are quinoid psilocyl oligomers. The blue colour can develop when the mushrooms are cut, picked, or bruised, and is considered an indicator of the presence of psilocybin. However, the potency of the mushroom may decrease as psilocybin degrades due to oxidation. While the blue colour can be an indicator of the mushroom's potency, it is not a foolproof method, as several other mushroom species can also bruise blue when picked and do not contain psilocybin.
| Characteristics | Values |
|---|---|
| Occurrence | Blue mushrooms are a type of "magic" mushroom, which can develop blue spots over time. These spots are considered "bruises". |
| Cause | The bluing reaction is caused by the presence of a metal compound, likely copper-based, and produced by an enzyme present in some, but not all, psilocybin mushrooms. |
| Potency | The blue bruising indicates the presence of psilocybin/psilocin, the chemicals that cause psychedelic effects. However, there is no clear consensus on whether the amount of bruising directly correlates to potency. Some sources claim that more bruising indicates higher potency, while others state that bruising lowers potency as it indicates the breakdown of psilocin, resulting in less active substance. |
| Safety | While blue bruising is generally considered safe, it is important to distinguish it from blackening, which could indicate mold or rot, making the mushrooms unsafe for consumption. Additionally, some mushrooms that bruise blue do not contain psilocybin and can be poisonous. |
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What You'll Learn
- Blue bruising is believed to lower the potency of mushrooms
- Bluing is an indicator of the presence of psilocybin
- Bluing is caused by the oxidation of psilocybin into different chemicals
- Blue bruising is an excellent way to identify magic mushrooms
- Blue bruising is not a foolproof strategy to identify magic mushrooms

Blue bruising is believed to lower the potency of mushrooms
Blue bruising, or bluing, is a natural process that occurs in some psilocybin mushrooms. It is believed that the bluing reaction is caused by the oxidation of psilocybin, which breaks down into different chemicals, including psilocin, the compound responsible for the psychedelic effects of magic mushrooms.
While blue bruising is an indicator that mushrooms contain the necessary chemical constituents to produce psychedelic effects, it is also believed to lower the potency of mushrooms. This is because, for bluing to occur, psilocin must first degrade and break down. Therefore, the more bluish bruising on a mushroom, the more psilocin has degraded, and the less active the compound is to produce psychedelic effects upon consumption.
However, it is important to note that the relationship between blue bruising and potency is not fully understood, with some people claiming that there is a correlation between bruising and potency, while others disagree. Additionally, some species of mushrooms that contain psilocybin do not bruise at all, and not all mushrooms that bruise blue contain psilocybin, as some non-psychoactive strains of mushrooms have also been known to develop blue bruising.
It is also worth noting that blue bruising should not be confused with blackening. Heavy blue bruising can sometimes appear black, but if mushrooms develop black spots that smell unpleasant, this is a sign of mould or rot, indicating that they may no longer be safe for consumption.
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Bluing is an indicator of the presence of psilocybin
Bluing is a natural process that occurs in some psilocybin mushrooms, specifically those from the genus Psilocybe. When these mushrooms are injured, they instantly develop an intense blue colour. This phenomenon is due to the oxidation of psilocybin, which breaks down into different chemicals, primarily quinoid psilocyl oligomers coupled via carbon 5. The blue colour can also be attributed to the presence of oxidised psilocybin and the degradation of psilocin by enzymes within the mushroom's cells.
The biochemical basis for the formation of the blue pigment in Psilocybe mushrooms has long been a mystery, attracting the attention of natural product chemists for decades. While the exact mechanism remains elusive, recent studies have shed some light on the process. It is now known that upon injury, two enzymes from Psilocybe cubensis, namely PsiP (a phosphatase) and PsiL (an oxidising laccase), carry out a two-step cascade reaction. This reaction prepares the psilocybin for oxidative oligomerization, resulting in the formation of blue products.
The blueing reaction in Psilocybe mushrooms is not just a visual curiosity but also serves an ecological purpose. The presence of psilocybin and the subsequent blueing reaction are believed to protect the fungus from mycophagous insects by interfering with their behaviour. Additionally, it has been hypothesised that the blue pigments may serve as an on-demand repellent against predators, possibly by producing toxic reactive oxygen species.
While bluing is considered an indicator of the presence of psilocybin, it is important to note that not all mushrooms that bruise blue contain these compounds. Some non-psychoactive mushrooms also exhibit bluing, and the intensity of the blue colour may not always correlate with the potency of the mushroom. Therefore, it is crucial to exercise caution when consuming wild mushrooms, as some blue-bruising varieties can be poisonous.
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Bluing is caused by the oxidation of psilocybin into different chemicals
Bluing in mushrooms is a well-known phenomenon that has attracted the attention of natural product chemists for decades. This colour change is particularly observed in the Psilocybe genus of "magic" mushrooms, which are known to produce the psychotropic compounds psilocybin and psilocin. When these mushrooms are injured, cut, or bruised, they instantly develop an intense blue colour.
The chemical basis for this colour change has long been a mystery, but recent studies have shed some light on the underlying mechanisms. It is now understood that the bluing is caused by the oxidation of psilocybin into different chemicals. Specifically, the oxidation of the 4-hydroxy group of psilocybin leads to the formation of a blue compound. This process is catalysed by the enzyme PsiL, which plays a crucial role in converting psilocybin into psilocin, its dephosphorylated form.
The oxidation of psilocybin results in the formation of a heterogeneous mixture of compounds known as quinoid psilocyl oligomers. These oligomers are structurally similar to indigo, a deep blue pigment commonly used in dyeing fabrics. The presence of multiple oligomers contributes to the different shades of blue and blue-green observed in various species of magic mushrooms.
The oxidation of psilocybin is part of a cascade reaction that occurs when the mushrooms are damaged. This reaction involves the removal of the phosphate group from psilocybin by the phosphatase enzyme PsiP, followed by the oxidation process catalysed by PsiL. The oxidation of psilocin, the product of this cascade reaction, results in the formation of the blue compounds that give the mushrooms their distinctive colour.
While the chemical basis for bluing in Psilocybe mushrooms has been elucidated, the purpose of this colour change remains a subject of speculation. One hypothesis suggests that the blue pigments may serve a protective function, acting as a natural repellent against insects or other predators. However, further research is needed to confirm this potential adaptive advantage.
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Blue bruising is an excellent way to identify magic mushrooms
Many species of mushrooms, including some magic mushrooms, develop blue spots over time, known as bruises or bluing. This is a natural process that occurs in psilocybin mushrooms. The blue colour is caused by a complex mixture of linked psilocybin oxidation products, specifically quinoid psilocyl oligomers, which are similar in structure to indigo.
The appearance of blue bruises indicates that psilocybin and/or psilocin was present in the mushroom at one time. Bluing is believed to influence the potency of psilocybin mushrooms, with more bluish bruising indicating less active psilocin remaining. However, some potent mushrooms may not bruise at all, and not all blue-bruising mushrooms are safe to consume. Therefore, it is important to use blue bruising as just one tool in your mushroom identification arsenal.
To identify mushrooms through bruising, nick the top and bottom of the cap and observe any colour changes. If the mushroom bruises blue, it could be an indicator of a magic mushroom, but further identification methods should be employed to ensure safety.
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Blue bruising is not a foolproof strategy to identify magic mushrooms
While blue bruising can be an indicator of the presence of psilocybin, it is not a definitive way to identify magic mushrooms. Some species of mushrooms that contain psilocybin do not exhibit any bruising at all. Additionally, several non-psychoactive strains of mushrooms have been known to develop blue bruising, although the reaction is believed to be different, resulting in distinct shades of blue.
The belief that more potent mushrooms bruise more easily is not always accurate. While bruising indicates the degradation of psilocybin, it does not necessarily correlate with the potency of the mushroom. Other factors, such as the age and condition of the mushroom, can influence its effectiveness. Therefore, relying solely on blue bruising to determine potency can be misleading.
It is crucial to understand that not all blue-bruising mushrooms are safe to consume. Some toxic mushroom species, such as certain boletes, also display blue bruising. As a result, using colour change as the sole method for mushroom identification can be hazardous. It is essential to consider other characteristics and employ multiple identification techniques to ensure safety.
Furthermore, the mechanism behind blue bruising in magic mushrooms is complex and not fully understood. While it is associated with the oxidation of psilocybin and the presence of certain metal compounds, the exact role of these compounds and the biochemical pathway remain elusive. Therefore, relying solely on blue bruising as an identification strategy can be unreliable, as the underlying factors influencing this reaction are not yet fully elucidated.
In conclusion, while blue bruising can be one of several indicators of magic mushrooms, it should not be the only criterion for identification and potency determination. It is essential to employ multiple identification techniques, consider other characteristics, and prioritize safety when dealing with wild or unknown mushrooms.
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Frequently asked questions
The blue coloration of mushrooms is due to a chemical reaction produced by the enzymes in mushroom cells reacting with oxygen and other molecules when damaged. This phenomenon is called "bluing" and is observed in psychedelic mushrooms such as "magic mushrooms" which contain the psychoactive compound psilocybin.
Bluing is believed to influence the potency of psilocybin mushrooms. This is because psilocybin must degrade and break down into psilocin for the bluish bruises to occur. Thus, the more bluish bruising on the mushrooms, the more psilocin has degraded, and the less active amount there is to produce psychedelic effects upon consumption.
Bluing is believed to be an excellent way to identify magic mushrooms and tell them apart from poisonous look-alikes. However, it is not a foolproof strategy as several other mushroom species can bruise blue when picked and do not contain psilocybin. Therefore, it is essential to consider all of a mushroom's features when trying to identify them and not rely solely on their colour.

























