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El vidrio
El vidrio
Tecnicas de restauracion
Colaboraciones
Colaboraciones
En este apartado hago una pequeñísima introducción al amplio mundo del vidrio y el cristal. Para profundizar en el tema hay los apartados de bibliografía.

El  término cristal comúnmente es aplicado al material transparente, frágil. Más correctamente, el cristal se refiere a un estado de materia con una estructura desordenada química, no cristalina. (Davison, 2003: 1)

Podemos considerar el vidrio como el primer producto de síntesis elaborado por el hombre a partir de una compleja mezcla de diversos componentes sometidos a altas temperaturas.(Carreras, 2006: 13)

Las piezas más antiguas conocidas
se han encontrado en yacimientos arqueológicos de Mesopotamia y de Egipto a mediados del tercer milenio.

A mediados segundo milenio aparecen los primeros vasos de vidrio. Su área de difusión se extiende por Egipto, Palestina, Siria, Mesopotamia, Chipre, Creta i Grecia. (Flos, 1987:17) que cita al mismo tiempo de: Vigil, M., 1969: 15).

A la literatura cuneiforme del segundo milenio a.C. procedente de Mesopotamia hay algunos textos con instrucciones bastante precisas para fabricar vidrio. (Carreras, 2003: 13).)

Las técnicas de fabricación del vidrio son muy diversas: tallado, estirado y modelado sobre una barra, amoldado o fusión, técnica de cera perdida, moldeado sobre un núcleo, modelado sobre un molde convexo, vidrio mosaico, soplado, soplado a molde. 

También hay diversas técnicas decorativas: pintado, abrasivas y pulido, el gravado y tallado, aplicaciones en caliente, y ornamentaciones de nervios y pellizcos extraídos con pinzas de las paredes de la pieza. (Carreras, 2006: 16)

Hago una introducción también a las deterioraciones del vidrio:
El vidrio puede sufrir varios tipos de degradación:
Deterioro físico
, que puede ser consecuencia de defectos en su manufactura, impactos, choque térmico, abrasión y tratamientos anteriores.
Desfiguración superficial
, que se deriva del uso, de incrustaciones durante el entierro, las manchas de productos e corrosión metálicos o de los metales que sustentan o forman parte de los objetos y la contaminación ambiental.
Deterioro químico
, que es el resultado de la composición interna. Podemos encontrar: Desalcalinización (cambio iónico): los álcali con carga negativa y los cationes metálicos están libres y se desplazan. Disolución de la red, la disolución de algunos elementos constituyentes del vidrio, puede causar la rotura de la red del cristal y la disolución del sílice.
El vidrio en sí mismo
: su naturaleza, la composición de la masa.
El entorno
, el entierro, aspectos químicos.
(Davison, 2003: 169-170)

Y finalmente, algunos síntomas visibles de deterioro:
Pérdida de la transparencia.
Iridiscente (La superficie del vidrio coge varias coloraciones, a causa de la interferencia en la luz que provocan los óxidos metálicos de la superficie del vidrio, el resultado son colores morados y rosas.).
Craquelado espontáneo, que pueden tener varias a causa, por ejemplo, la deshidratación de la superficie, perdida de sílice y como resultado final pérdida de volumen formándose el craquelado.
Superficies lechosas o parecidas a un esmalte.
Decoloración negra.
Formación de una superficie con pequeños cráteres.
Y muchos otros. (Davison, 2003: 183)
Detalle de la unión entre el contenedor ya base del pie de una copa.

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Surtidor o pico de un botijo, con forma femenina.
Detalle de la decoración del asa de un botijo. En la part externa con botones de vidrio blanco, y en la interna con un cordón de vidrio blanco retorcido.
Detalle del contenedor de una copa, con decoración de lacticinios trenzados, formando retículas a retortti (Cita: “Vidrio Español del Museo de Artes Decorativas de Praga.”, 2002.)
Detalle de la superficie externa del contenedor de un botijo.
Botijo afectado por lixiviación. El cristal químicamente inestable. (Ver Glosario: Humedad.)
* Bibliografía:
CARRERAS, Teresa; FLOS, Núria; VVAA.  La fragilitat en el temps. El vidre a l'antiguitat. Museu d'Arqueologia de Catalunya. Generalitat de Catalunya. Barcelona, 2005.

DAVISON, Sandra.   Conservation and Restoration of Glass. Ed. Hutterworth Heinemann; British Museum, Londres, 2003.

FLOS Travieso, Núria, Baetulo. Els vidres.  Monografies Badalonines. Núm. 10. Museu de Badalona.  Badalona, 1987.