Abstract: Anticollision-lamp operable in day-light and at night. It is known to provide separate day-light lamps with a high light output, and night-lamps with little infrared radiation in order not to dazzle night vision goggles. The anticollision light according to the invention comprizes at least one optical interference filter (11) with an average transmission factor in the infrared which is less than 4% of its value in the visible white or red. Preferred embodiments comprize among others: an average transmission factor in a spectral domain larger than 80%, preferably 90% and most desirably 95%; the combination of an interference filter (11) with an absorption filter (10) transparent for red light; an interference filter (11) consisting of several plane elements arranged octagonally; and a band-pass interference filter with a transmission domain situated in the visible red and the transmission factor of which is at least 104 times larger than in an infrared domain.

Abstract: A method for preventing mercury poisoning through the dissolution of mercury in amalgam dental fillings by the use of a toothpaste including selenium iodide or components which form selenium iodide when used in at least effective quantities.

Abstract: A process for the production of iron(III)hydroxide/dextran complexes in which from 2.0 to 2.6 vals of carbonate are slowly added to an acid solution containing a partially depolymerized dextran having an average molecular weight of from 1000 to 10,000 and an iron(III)salt, from 50 to 100 kg of iron ions being used per 100 kg of dextran, after which an alkali metal hydroxide or ammonium hydroxide is added to the solution in such a quantity that, including the carbonate added, approximately 3 vals of anions are added until a pH value of no less about 10.5 is reached, the suspension formed is converted into a solution by heating and the solution is worked up in known manner.The invention also relates to sterile pharmaceutical solutions containing these complexes.