light in wavelengths between 220 and 376 nm the visible light is covered over a range from 350 to 376 nm and the ultraviolet range from 220 to 350 nm due to the added additives namely the euvenyl blue and cyasorb uv 24 the jacket tube is physiologically questionable the layer thickness of the jacket tube is 0 7 mm the following components were used for the composition of the inner tubing the layer thickness of this inner tubing is 0 65 mm due to its additives it can be called physiologically unobjectionable the composite tubing of this example can be used to conduct materials which are sensitive to the stated wavelength ranges of visible and invisible light these ranges can be varied by replacing the euvenyl blue of the example by any other desired dyestuffs the following palette for example may be considered ______________________________________irgazin nm ranges from 380 to 510yellowirgazin nm ranges from 380 to 540orangeirgazin nm ranges from 450 to 570 of ciba geigy ared basel switzerlandirgazin nm ranges from 520 to 560violetirgazin nm ranges from 580 to 750blue______________________________________ one or a plurality of these dyestuffs can be used individually or in combinations with one another a composite tubing is produced having.