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Technical and artistical descriptions
cement : A mixture of linseed oil and whiting, applied under the lead tip wings of the stained glass to ensure water resistance and the rigidity of the panel.
acid engraving : Deglazing the surface of a piece of glass by using hydrofluoric acid; process used on dual glass to achieve an embossed decorative effect of colours.
assembly paperboard : A live-sized model of the stained glass marked precisely with the network of lead or copper strips.
Barlotière : A flat metal bar marrying the shape of the panels it is supporting.
calibre : Type of stiff paper used as a form or a template to cut out a piece of glass.
cementation colour : A colour made from colouring of metallic origin which, with the help of cementum, or vehicle, penetrates into the outer layers of the glass and colours it after baking.
cive : A small cylindrical piece of blown glass with a bulge in the middle.
cutting with a calibre : Cutting made by using the edges of a calibre as a guide.
Enamel : Glazeable colouring associating a transparent flux tinted with metallic oxides, used to colour white glasses or to highlight the shades of coloured glasses.
flux : Substance used to lower the point of fusion of glazeable colours.
free hand cutting : Repetitive cutting of pieces of glass of similar form, using a measuring rod rather than a stiff paper calibre.
glass slab : A 30 x 20 cm piece of glass of about 25 mm in thickness, poured into a mould and used to make assembled stained glasses using reinforced cement or epoxy resin.
glazeable : Which can achieve a vitrious aspect through firing.
glazeable colour : Paint composed of a colouring and a flux which, after being deposited on the glass before baking, is transformed by fusion into a vitreous material melding with the glass.
jaune d’argent : Cementation colour, not needing any flux, composed or argent salts and ochre, which penetrate into the outer layers of the glass and give it a yellow, transparent colour.
lead caming : Fitting the edges of each piece of glass into the gorges of the lead strips, then folding down the wings onto the glass before soldering the various lead intersections.
lead channel : or lead heart, the internal transversal part of the “H” shaped strip of lead, inserted during the working of the lead came between the pieces of glass.
lead network : An assembly of lead strips on a panel or a pane.
lead rubbing : Obtaining an image on a piece of paper of the network of lead strips of the stained glass to be restored by pressing the sheet on the lead strips and rubbing with a piece of graphite.
lead tip wing : Visible part of the lead tip, of varying widths, that holds the pieces of glass together.
panel : Strictly speaking each part of the stained glass is delineated by a metal brace.
plomb de casse : Very thin lead used to restore or to fix fragments of a broken piece.
releading : Partial or complete replacement of the broken or damaged strips of lead of an antique stained glass with new lead strips.
shearing : Correcting rough edges, or making certain inward cuts by clipping the edges of the glass with pliers.
stencil : Transfer made from the assembly paperboard on stiff paper which is then cut into calibres.
thermal fusion : Firing a piece of glass on an embossed support to a temperature beyond its fusion point to give it a special shape.
triple blade scissors : Scissors used to cut out the calibres and mounted with an extra blade in the centre which cuts out a band the width of the lead heart or the copper ribbon
vergette : Metal tips used to reinforce the structure of panels, fixed by soldering them into the lead network.
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