Abstract: The subject of the invention is a UV dosimeter suitable for visual evaluation, which is consisted of a light-sensitive layer on a carrier and a cover layer. The thickness of the light-sensitive layer is 10-40 &mgr;m, the concentration is 95-105 g/dm3 and calculated to the volume of the suspension it contains in a water bloated high molecular weight polymer amenable to hardening 0,004-0,2 mole/dm3 of argentic (I) oxalate, 0,0014-0,07 mole/dm3 of water soluble multivalent metallic oxalate and 0,00044-0,006 mole/dm3 of complexing additive. The light-sensitive layer is fitted with a cover layer, which is light-transmitting in the UVB range excluding the humidity of the air.

Abstract: The invention relates to partially novel metal complexes, salts and double salts of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane compounds of the formula (I), ##STR1## wherein Q.sup.1 and Q.sup.2 mean hydrogen or a group of the formula (III), ##STR2## in the groups of the formula (III) the R subtituents independently represent hydrogen, a C.sub.1-5 straight or branched chain alkyl group, a C.sub.2-5 straight or branched chain alkenyl group, phenyl or phenyl-C.sub.1-5 alkyl group, the two latter ones optionally being substituted on their aromatic part by one or more halogen(s), C.sub.1-5 alkyl, C.sub.1-5 alkoxy, cyano or nitro group(s), with the proviso that at least one of Q.sup.1 and Q.sup.