| abstract |
(57) [Summary]nThe present invention comprises the following treatment steps: -Acrylate monomer or methacrylate monomer, a step of using various mixtures thereof as a polymerizable monomer, -a photochromic dye and a polymerizable monomer together with a polymerization initiator. A method of producing a photochromic object composed of a polymer containing at least one spirooxazine compound, which comprises the steps of: -Adding more than one photochromic dye, at least one of which is not spirooxazine, and-the concentration of the spirooxazine compound, in order to obtain a neutral grey, neutral brown or green photochromic coloration of the polymerizable mixture. 0.045% by weight or less, based on the amount of monomer that is 1 wt% or more based on the amount of that monomer is characterized in that a. |