Photographic Glass Characterization
Graded Cobalt Blue light ref. G161, origin: Glasshütte Lamberts (Germany)
Graded Gold Pink pieces, origin: Glasshütte Lamberts (Germany)
Non-standard yellow ref. Special Yellow UV sample, origin: Glasshütte Lamberts (Germany)
Light Turquoise ref. 1242xx, origin: Glasshütte Lamberts (Germany)
Dull and relatively light Blue-Violet, ref. 1302F, origin: Glasshütte Lamberts (Germany)
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!)