Black multilayer product with deep gloss effect with light transmittance less than 0.1%, determined in accordance with ISO 13468-2 at 780 nm on a sheet of thickness 2 mm comprising: 1) a base layer produced by the injection-moulding process comprising • at least one thermoplastic, where the thermoplastic is polycarbonate or a polycarbonate blend, • a quantity of from 0.05 to 0.15% by weight of nanoscale carbon black, where the carbon black is a pigment black with average primary particle size from 10 to 20 nm, determined by scanning electron microscopy, • a mould-release agent based on a fatty acid ester in a concentration of from 0.1 to 0.5% by weight, where the surface defect rate of the base layer produced in the injection-moulding process is less than 10 surface defects per cm 2, where the surface disturbances are detected by means of optical microscopy by viewing in incident light through a blue filter in the HLS colour system on a scale from 0 to 255 for the H, L and S values, where the threshold HLS values for detecting surface disturbances are set in a manner such that a blue colour thereof is captured at H = 127 with L values greater than 157 and with S values greater than 107, where surface disturbances > 10 μm of blue appearance are evaluated as surface defects, and where the abovementioned quantitative data are based on the entire composition of the base layer, 2) at least on one side of the base layer, a scratch-resistant polysiloxane-based coating of thickness from 2 to 15 μm, comprising at least one UV absorber. 1) a base layer produced by the injection-moulding process comprising • at least one thermoplastic, where the thermoplastic is polycarbonate or a polycarbonate blend, • a quantity of from 0.05 to 0.15% by weight of nanoscale carbon black, where the carbon black is a pigment black with average primary particle size from 10 to 20 nm, determined by scanning electron microscopy, • a mould-release agent based on a fatty acid ester in a concentration of from 0.1 to 0.5% by weight, where the surface defect rate of the base layer produced in the injection-moulding process is less than 10 surface defects per cm 2, where the surface disturbances are detected by means of optical microscopy by viewing in incident light through a blue filter in the HLS colour system on a scale from 0 to 255 for the H, L and S values, where the threshold HLS values for detecting surface disturbances are set in a manner such that a blue colour thereof is captured at H = 127 with L values greater than 157 and with S values greater than 107, where surface disturbances > 10 μm of blue appearance are evaluated as surface defects, and where the abovementioned quantitative data are based on the entire composition of the base layer, • at least one thermoplastic, where the thermoplastic is polycarbonate or a polycarbonate blend, • a quantity of from 0.05 to 0.15% by weight of nanoscale carbon black, where the carbon black is a pigment black with average primary particle size from 10 to 20 nm, determined by scanning electron microscopy, • a mould-release agent based on a fatty acid ester in a concentration of from 0.1 to 0.5% by weight, where the surface defect rate of the base layer produced in the injection-moulding process is less than 10 surface defects per cm 2, where the surface disturbances are detected by means of optical microscopy by viewing in incident light through a blue filter in the HLS colour system on a scale from 0 to 255 for the H, L and S values, where the threshold HLS values for detecting surface disturbances are set in a manner such that a blue colour thereof is captured at H = 127 with L values greater than 157 and with S values greater than 107, where surface disturbances > 10 μm of blue appearance are evaluated as surface defects, and where the abovementioned quantitative data are based on the entire composition of the base layer, 2) at least on one side of the base layer, a scratch-resistant polysiloxane-based coating of thickness from 2 to 15 μm, comprising at least one UV absorber.