Cathedral Glass vs. Opalescent: The Play of Light Transparency

In the 19th century, Cathedral Glass was the standard for traditional church windows. Louis Comfort Tiffany, however, often found this too 'flat' and one-dimensional, which led him to develop his famous Opalescent glass. Nevertheless, Cathedral Glass remained an indispensable tool in his studio.

Contrast and Depth

The major difference lies in light transmission. While opalescent glass is milky and diffuses light, Cathedral Glass is completely transparent (though colored). Tiffany often combined these two types in a single design:

• Sky and Water: By using transparent glass for the sky, the background appeared further away, adding depth to the landscape.
• Light accents: Direct light shining through Cathedral Glass created brilliance, while the opalescent sections emitted a soft glow.

It is precisely the alternation between these two glass types that gives a Tiffany window or lamp its dynamism. It compels the eye to look through the glass in one place, and focus on the glass in another.

View all terms in our A-Z Glossary.