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The paper Maltsev et al. [88], analyzed samples of several varieties of Krasnodar tea. This tea is the singular Russian tea product, the chemical composition of which was here studied for the first time. In practice the contents of 16 elements from phosphorus to lead have been determined. Nineteen commercially available samples of Krasnodar tea have been investigated. Table 3.4 shows the name, type, shape, and quality of each tea according to producer information on the package. Krasnodar tea plantations are the northernmost of all tea plantations in the world. Tea in the Krasnodar region has been grown since the beginning of the twentieth century. The first attempts to grow tea bushes brought from China proved unsuccessful. In the harsh winter, the bushes died. Only seeds brought from Georgia managed to grow tea. The first tea plantation appeared near the city of Sochi, in a valley of mountains 220 m above the sea. The history of Russian tea breeding began with this plantation. The tea qualities “granulated”, “long leaf,” and “packed” are common in the classification of tea quality.

One of the original types of Krasnodar tea is a skull tea. It is produced by two enterprises: Dagomys Chai Group of Companies and Matcsestin Tea Factory. It includes shank, stem particles, and tea leaf. This tea does not belong to the varieties of tea, but it is not inferior to other types of Krasnodar tea. In fact, in some parameters it exceeds many granulated and packaged varieties. Skull tea can be stored longer than usual. It is necessary to note that in Japan tea is also made from shank and thin stems of tea bush. It is called kukicha. Raw materials that are used in the production of skull tea undergo the same treatment as other parts of the plant. Based on the kind of treatment and fermentation, a green or black skull tea is obtained.

Table 3.4 Description of analyzed tea samples from Krasnodar.

Code of a sample	Tea type	Name and origin
A1	Black granulated tea, first grade	Azerchai, “Kuban‐Tea”, Krasnodar region, Belorechensk
A2	Tea black long leaf “Bouquet”
A3	Tea Green Superior Grade, packed
A4	Tea black “Bouquet,” packed
A5	Tea Black Superior Class “Peko”
D1	Tea black skull (petiolar)	Dagomys Chai, Krasnodar region, Sochi
D2	Green long leaf (Bayh) Tea “Extra”
D3	Black long leaf Tea “Extra”
D4	Black long leaf tea № 36
D5	Tea black “Extra” packed
D6	Green tea packed
M1	Tea black classic “Selection” packed	Matcsesta Tea Factory, Matcsesta, Sochi, Izmailovka village
M2	Tea green classic “Selection” packed
M3	Tea black classic “Bouquet”
M4	Tea green classic “Bouquet”
M5	Tea black long leaf “Kazachok”
M6	Petiolar green tea
M7	Tea black skull (petiolar)
С1	Tea black long leaf classic	Krasnodar since 1901, Sochi, Solokhaul village