Disclosed are certain polymeric compounds and their use as organic semiconductors in organic and hybrid optical, optoelectronic, andor electronic devices such as photovoltaic cells, light emitting diodes, light emitting transistors, and field effect transistors. The working end includes a rotatable mixing tool enclosed in part by a blade guard. The final casting is made of fortified cement that is permanently stained with metallic salts in an HCL solution producing the desired coloration matching that of the original specimen while masking the color of the concrete. The identity selector exports the information cards from the user device and determines which user identity satisfies a security policy promulgated by a relying party as part of an authentication process within the context of an online interaction.