MODEL RELEASED. Allergy test. Arm of a twenty five year old woman undergoing a skin scratch allergy test. This test is used to identify substances (allergens) that cause an allergic reaction in the patient. Weak solutions of various suspected allergens and controls are dropped on to the skin. Letters on the skin show the location of each allergen. The skin under each drop is then scratched with a needle to introduce the allergen under the skin. The skin is observed for a reaction. If an area of skin becomes swollen or red the patient is allergic to the substance at that location.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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