Observing the 'Hidden World' Beneath the Skin

A group of scientists has succeeded in temporarily rendering parts of the skin and muscle tissue invisible using a type of edible dye, allowing for a closer look at the body's functions beneath the skin. The amazing world of our body is hidden beneath a protective and invisible covering. The skin not only protects us from environmental factors such as temperature changes, radiation, and surface injuries, but it also means that much of our body's remarkable functions occur away from the eyes of external observers. However, a precise understanding of body functions and what causes normal or abnormal behaviors of various organs depends on our ability to see inside the body. For a long time, the only way to see inside the human body was through dissection and opening the body, a procedure performed on deceased individuals that allowed us to understand some internal functions and the fundamental structures that compose it. Even today, exploratory surgeries are still performed in specific cases. The aim of these surgeries is to open the body to identify the cause of a condition that other identification and diagnostic methods are unable to determine. With the development of science and technology, new methods for seeing inside the body have been invented. These advancements have occurred simultaneously in both invasive and non-invasive methods. Well-known invasive methods include endoscopy, colonoscopy, and sending imaging robots into the body. In these methods, an external tool equipped with a camera is sent inside the body through communication channels to provide doctors with a precise image of internal body functions and assist in some therapeutic actions such as burning stomach ulcers, removing masses, and sampling internal body parts. In specific cases, doctors use a camera-equipped capsule that, after being swallowed, allows the camera to provide precise images of the person's digestive system. Non-invasive imaging methods, perhaps the most famous of which is X-ray imaging, help doctors take a closer look at hidden tissues beneath the protective skin. These methods sometimes use wavelengths with higher penetration coefficients (such as X-rays) and sometimes employ more complex structures like creating a strong magnetic field around the body and resonating and recording its reflections. However, researchers are still eager to observe internal body functions in a more direct way. In specific cases, some diseases, primarily resulting from genetic mutations, cause individuals' skin to become thinner or change its light reflection coefficient, but can a temporary and non-invasive method be found to make parts of the skin or other tissues invisible without damaging them, allowing for the observation of hidden behaviors beneath? The results of a study published in the journal Science report the success of a group of researchers in this endeavor using a relatively simple method. In this method, researchers introduce a combination of a type of edible dye approved by the U.S. Food and Drug Administration, primarily used to color foods like chips or puffs, into the skin layer. This modified compound, depending on the reflective coefficient defined for it, causes part of the skin to become invisible after a while, allowing the behavior beneath it to be observed. The function of this compound, although it seems strange and even magical at first glance, is physically simple. There are two reasons we can see an object in visible light; either the object emits light radiation in the electromagnetic spectrum (like the sun, a candle, or a lamp) or it reflects light received from the environment. If we cannot see beneath the skin and only see the skin itself, the reason is that visible light rays, when they hit the skin, are reflected due to the molecular distribution and texture of the skin, and thus do not reach the deeper layers, and we only see the skin tissue. If you remove the skin layer, now light can reach the underlying tissues and reflect off them, making them visible. The operation of this new compound is based on this structure. This compound, whose amount and coefficient are determined according to the skin texture and desired penetration coefficient, temporarily changes the arrangement of the molecular composition in the skin that causes light reflection, so that instead of being reflected, light penetrates to the deeper layer and reflects from the inner tissue. On the way out, the skin again acts transparently against this reflection, and we can observe the internal organs. Researchers in this experiment, after testing this method on non-living tissues, also tested it on the bodies of mice and were able to observe the function beneath the temporarily invisible skin. The researchers involved in this study believe there is no prohibition against conducting this experiment on humans. But what benefit could such a procedure have for medicine? Perhaps the most important significance of this method is the direct access and viewing of internal organs to observe their function under normal conditions as well as conditions where a specific ailment is present. In this case, identifying the problem and providing a solution for it will be easier for doctors. Such an approach, if health is confirmed and developed, could serve as a window that reveals a unique and previously hidden view to the eyes of the public and especially scientists. A window into the human body. Remember that although the substance used in this experiment is a type of edible dye available on the market, this does not mean that you can make your body invisible by covering part of it with this edible dye. Please refrain from attempting this at home under this pretext.