Glass Plate Casting & Brass Pattern Stencil Craft in Athangudi Tilemaking

The most distinctive visual attribute of an authentic Athangudi tile is its mirror-like, ultra-smooth surface sheen. Unlike modern vitrified tiles that achieve gloss through liquid ceramic glazes fired at extreme temperatures, or terrazzo floors that require days of heavy mechanical grinding and chemical crystallizing waxes, the Athangudi tile obtains its specular reflection purely through float glass contact physics.

Float glass is manufactured by floating molten glass over a bath of molten tin, resulting in a surface that is molecularly planar and free from surface irregularities. When a fine slurry of white Portland cement and micronized mineral pigments is poured onto this glass, the liquid paste settles intimately against the glass surface. As the cement particles hydrate and consolidate, they duplicate the exact planarity of the glass substrate down to the sub-micron scale, creating a finish that reflects ambient light with crisp clarity.

The artistic soul of Athangudi tilemaking resides in the koodu—the hand-soldered brass pattern stencil. In the villages of Chettinad, a tiny cadre of master tinsmiths and coppersmiths fabricates these stencils entirely by hand, utilizing traditional sheet brass measuring 0.8 to 1.0 millimeters in thickness.

The artisan transfers an intricate drawing onto the brass sheet, cuts the metal into long ribbons using curved tin snips, and hand-bends the ribbons into intricate floral rosettes, interlocking stars, or paisley arabesques. Every junction is soldered with jeweler’s tin-lead alloy, and rigid reinforcement bridges and upright wire loop handles are added across the top. The bottom edges of all divider ribs must be ground dead flat on a granite dressing stone so that when the stencil is seated on the glass, there is zero gap beneath the ribs where liquid slurries could leak.

Mixing the colored cement slurry requires precise rheological balance. If the slurry is too watery, it will seep under the brass divider ribs and blur the design; if it is too viscous, it will trap air bubbles against the glass, causing unsightly pinholes on the finished tile face. Master tilemakers blend white Portland cement, ultra-fine quartz flour, and powdered mineral pigments with water to achieve a specific thixotropic consistency resembling warm honey.

Using spouted brass ladles (karandi), the craftsman fills each compartment with rapid, rhythmic motions. The critical moment arrives within 25 seconds of the pour: the vertical stencil extraction. Gripping the dual brass handles, the artisan lifts the stencil straight up. The movement must be completely vertical and executed without hesitation; even a half-millimeter lateral wobble will drag the metal rib through the fluid cement, compromising the razor-sharp boundary lines between colors.

Working in the tropical heat of Tamil Nadu, where summer temperatures frequently exceed 40°C, brass stencils undergo continuous thermal expansion. Simultaneously, prolonged exposure to the highly alkaline environment of wet Portland cement paste (pH 12–13) induces chemical oxidation and crusting along the brass ribs.

To maintain dimensional accuracy across hundreds of tile cycles, craftsmen employ strict cleaning protocols. Between every individual casting, the stencil is immersed in a water tank to prevent cement from flash-drying on the ribs. At the end of each working shift, stencils are soaked in a mild citric wash to dissolve calcium carbonate deposits, followed by burnishing with brass-wire brushes and checking on a precision granite surface plate to re-establish true coplanarity.