"Gardenia Blue Color" is not mentioned in "Tiangong Kaiwu", so the following is only to use modern chemical knowledge to answer this question in classical Chinese.
Gardenia Blue Color, the Chinese name is often called Gardenia Blue, its main component is quite complex, is composed of a variety of substances. The preparation of gardenia blue often uses gardenia fruit as the starting material. Gardenia fruit is rich in gardenioside and other ingredients.
After a series of processes, gardenioside may undergo chemical changes such as hydrolysis and transformation under specific conditions. The main components of gardenia blue contain products formed after the transformation of gardenioside. One of the key components is the pigment substance with a specific chemical structure, which gives Gardenia Blue its unique blue color.
This pigment component often contains specific functional groups in its chemical structure, which have an important impact on light absorption and reflection characteristics, so it appears blue. In addition to the pigment component, Gardenia Blue may also contain a small amount of other substances that accompany the preparation process, such as some sugars, protein hydrolysis fragments, etc. Although these substances are not the key to showing blue color, they may have a certain impact on the overall physical and chemical properties of Gardenia Blue, such as solubility and stability.
Overall, the pigment substances in the main components of gardenia blue dominate its blue appearance, while other accompanying substances play an auxiliary role in the surrounding properties, together constituting this special pigment product.

Gardenia blue pigment is used in meals and involves a wide range of uses. Its dark blue color can add visual charm to food, so it is often used in the coloring of various foods.
In the genus of cakes and desserts, gardenia blue pigment can give it an elegant blues, making the appearance more attractive. If you make a delicate blue cake, when kneading flour, it is suitable for this pigment and steamed out. The cake is a pleasant blue, which not only adds appetite, but also enhances the unique charm of dim sum.
It is also used in drinks. For example, preparing characteristic blue tea, or incorporating gardenia blue pigment into juice, can create a different visual experience. The tea is clear and blue, blending with the tea aroma, giving it a unique feeling; the juice adds this pigment, the color is novel, and it can attract the attention of the drinker, which is unique in the market competition.
It can also be seen in sugar products. When making hard candies and fudge, gardenia blue pigment can make the candy appear fresh blue, standing out in the colorful candy array, bringing novel choices to consumers.
Furthermore, in frozen foods, such as ice cream, popsicles, etc., gardenia blue pigment can create a unique appearance. Blue ice cream, in the hot summer, seems to bring a hint of coolness, not only delicious taste, but also visually refreshing.
When using gardenia blue pigment, the dosage should be controlled in accordance with food safety regulations to ensure the safety and quality of food, so that this pigment can play its color-enhancing and colorful role in the food field and add charm to the diet and life.

Gardenia Blue Color is gardenia blue pigment, and its safety has been studied by many parties and is quite reliable.
Looking at its raw materials, gardenia blue pigment takes gardenia fruit as the starting material. Gardenia, a traditional Chinese herbal medicine and food raw material for a long time, has a long history of application in China. Ancient books such as "Compendium of Materia Medica" have records about gardenia's medicinal use and dietary therapy, and its safety has been verified over time. Gardenia blue pigment is prepared based on gardenia, and it has a reliable foundation from the source.
Then explore its preparation process. Modern methods for preparing gardenia blue pigment are mostly milder methods such as biological enzyme methods. The biological enzyme method is based on the specific catalysis of specific enzymes on substrates, and under relatively mild temperature, pH and other conditions, the relevant components in gardenia are converted into blue pigment. This process is not only efficient, but also greatly reduces the residue of chemical reagents and reduces potential hazards. Compared with some crude extraction methods in the past, modern process products have higher purity and better safety.
And gardenia blue pigment has been widely used in food, medicine and other fields. In the food industry, it is often used as a coloring agent to add a unique touch of blue to various foods. In the market application for many years, safety accidents caused by gardenia blue pigment have rarely been seen. Many food regulatory agencies have also included it in the list of food additives that can be used, and there are clear and strict regulations on the scope and limit of its use. This also confirms that its safety has been authoritatively recognized from the side.
There are many scientific studies on the safety of gardenia blue pigment. Experiments have shown that the acute toxicity of this pigment is very low, and long-term intake has no obvious teratogenic, carcinogenic, mutagenic and other adverse effects. During the metabolism process in the body, it can be excreted in its original form or simple metabolites, and will not accumulate in the body, which has a slight impact on the normal physiological functions of the body.
It can be seen from the above that gardenia blue pigment is quite safe, and there is solid evidence to support its safe application in related fields, whether from the source of raw materials, production process, or application practice and scientific research.

The color of gardenia blue has many advantages over other colors.
First, gardenia blue originates from natural gardenia, which is natural. Compared with many synthetic pigments, it is purer and has no harmful chemical additions. It is beneficial to people's health. It is suitable for coloring many foods and drinks, making people feel at ease.
Second, gardenia blue has a unique hue, showing a faint blue tone, fresh and elegant, unlike the common red, yellow, green and other colors. In the fields of dyeing, painting and other fields, it can create a different atmosphere and add a unique charm to the work. Its color is calm and agile, which can make the picture or fabric show an elegant style.
Third, gardenia blue has good stability. Under different environmental conditions, such as common temperature and pH changes, its color is not easy to fade, and it can maintain a bright color for a long time. This characteristic is extremely important in the textile printing and dyeing industry. The dyed fabrics last for a long time, and the original color can still be maintained after washing many times, which greatly improves the quality and durability of the product.
Fourth, gardenia blue has a wide range of applications. In addition to food, textiles, and painting, it can also add unique colors to products in the cosmetics industry. In the pharmaceutical industry, it can be used for drug icing or capsule coloring, which is both beautiful and safe. Its versatility makes it play an important role in many fields.
Fifth, from an environmental perspective, the production process of gardenia blue is relatively green and environmentally friendly. Using natural gardenia as raw materials, it is produced with less impact on the environment than synthetic pigments, which is in line with the current green development concept. In today's pursuit of sustainable development, this advantage is particularly prominent and can lay the foundation for the long-term development of the industry.

The color of gardenia blue, what is the production process?
The color of gardenia blue is made by taking gardenia as the source and through complicated processes.
At the beginning, choose the ripe gardenia fruit, which is yellow and plump in color. After picking, wash it with water to remove its impurities. Then, put the gardenia fruit in a mortar, pounded and finely crushed, so that the active ingredients in it are easy to precipitate.
Then, soak it in an appropriate amount of water, and the soaking time needs to be precisely controlled. If it is too long, the taste will be thin, and if it is too short, the color will be difficult to come out. After soaking, filter the liquid with a fine silk cloth, and the obtained filtrate will be clear and yellowish.
Take this liquid again, put it in the kettle, and slowly boil it over a slow fire. When boiling, special personnel need to be on duty to observe the change of its color and observe the rise of its qi. The heat is very important. If the fire is fierce, the color will be burnt and dark, and if the fire is light, the color will be light but not strong. When the liquid is gradually thickened and the color is light blue, let it stand.
To be cooled, hold it in a special container, seal it, and place it in a cool and dry place. This is the first time the color of gardenia blue is formed.
However, if it is to be pure and bright, it needs to be further refined. By precipitation, the slightest suspension will be removed; by distillation, the purity of its color will be improved. Repeat this several times, and finally get a pure and bright gardenia blue.
This color is very useful in the fields of dyeing and weaving and diet. When dyeing and weaving, it can make the fabric unique and lasting; in the meal, it can increase the beauty of its color and luster, tempting appetite. Its production process contains the wisdom of the ancients, and the subtlety cannot be obtained without careful study.