TASK DEFINITION: Translate the given Spanish text to English
PROBLEM: Optionally, a tape 7 with indicator data is incorporated.

SOLUTION: OPTATIVAMENTE SE INCORPORA UNA CINTA (7) CON DATOS INDICADORES.

PROBLEM: In addition, the present invention provides agents identified by such methods.

SOLUTION: Ademas, la presente invencion provee agentes identificados por tales metodos.

PROBLEM: Insulating glazing unit (3) comprising at least two substantially parallel glass sheets (30, 31) that are separated by at least one air or gas space (32), further comprising a spacer (5) that is located at the periphery of the glass sheets and keeps the two glass sheets at a distance from and parallel to each other, and comprising adhesive means that attach the spacer to each glass sheet at two opposite mounting sides (52, 53) thereof, characterized in that for at least one side of the glazing unit, the spacer (5) includes a mirror-type reflective surface (54) on its inner face (50) that is in contact with the gas space.

SOLUTION:
Un acristalamiento (3) aislante que comprende al menos dos hojas (30, 31) de vidrio sustancialmente paralelas, que se separan por al menos una cavidad (32) llena de aire o gas, un separador (5) que se dispone en la periferia de las hojas de vidrio y que mantiene las dos hojas de vidrio separadas y paralelas, y medios de unión adhesiva para sujetar el separador a cada hoja de vidrio mediante dos de sus caras (52, 53) opuestas, cuyas caras se denominan caras de sujeción caracterizadas porque el separador (5) comprende al menos para un lado del acristalamiento, una superficie (54) reflectante con función tipo espejo en su cara (50) interna en contacto con la cavidad llena de gas.