„True beauty comes from within“. In the 1970s and 1980s, this wisdom was used in a slightly modified form as an advertising slogan for a food supplement and cosmetics manufacturer, which promoted the natural beauty that comes from within.
The concept of the tube soul, which the material describes, that covers the inner surface of a plastic or rubber hose. is a metaphor for the beauty or character of a hose.
The hose core comes into direct contact with liquid media such as water, oil, milk or even dry-powdery or gaseous media. It must therefore be made of suitable materials with appropriate resistance, strength and physiological properties. The previously cited naturalness of natural rubber as the material of the hose core of a rubber hose can no longer be assumed.
Equipped with the right inner values, the outer appearance of a hose, which is often presented in shiny colours, is almost just a decorative accessory and literally not as important as the inner values that matter.