Photographic Glass Characterization

by adrien

g161

Graded Cobalt Blue light ref. G161, origin: Glasshütte Lamberts (Germany)

rose_or_clair

Graded Gold Pink pieces, origin: Glasshütte Lamberts (Germany)

uv

Non-standard yellow ref. Special Yellow UV sample, origin: Glasshütte Lamberts (Germany)

1242xx_2332

Light Turquoise ref. 1242xx, origin: Glasshütte Lamberts (Germany)

1302f_3034

Dull and relatively light Blue-Violet, ref. 1302F, origin: Glasshütte Lamberts (Germany)

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When working with mouth-blown “Antique” glass (the glass traditionally used to make stained-glass), the irregularity of the material is a given property. Every sheet is unique and its thickness varies between 2 to 6-7 mm, with an average thickness of about 3 mm.

For perfectly transparent sheets, the color of the glass depends on the thickness of the material. If you want to have a high-level of control over the color that you want, a possibility is to measure the glass thickness using a digital camera and a light table.

However, this is not easy. The light-table non-uniformity has to be taken into account to correct the pictures, as I did here.

It’s been a few months that I’ve been developing software/hardware solutions to perfeclty measure the transmission of light that is characteristic of every single piece of mouth-blown glass. It now works pretty well.

(If ever you are interested by the technique you can leave a msg!)