This is a second great example of a vintage/antique pressed glass cup with press lines that help to indicate to you (the buyer or owner) that it is likely Lead-free. Press lines almost always are a good indicator that an antique or vintage functional glassware item (mug, vase, bowl, platter, etc.) is Lead-free (see images below).
This is not ALWAYS the case, of course — but is almost always the case…in more than 10 years of testing consumer goods for Lead using XRF technology – including thousands of items of this nature – I have only once tested a glass item with press lines (lines left over from the manufacture of typical pressed-glass of this vintage) that ended up being positive for a high level of Lead [that sole anomaly was a Waterford Crystal (Leaded crystal ) beer stein, apparently intentionally made to imitate the look of vintage pressed glass, as a design choice].
The images below are close-ups of the press line on the handle and side and base of the cup. As a result of the prominent press line on the handle of this glass – as one example – (as well as other qualities that made me nearly certain it was pressed glass, not cut crystal), I was fairly certain that the glass would be Lead-free prior to testing it with an XRF instrument. I was not sure, however, whether or not the red pigmented areas had Cadmium, but – given the type of wear to the colored areas – since it appears to be a post-manufacturing applied color (not a color embedded in the glass) on a vintage piece – I also suspected it would be Cadmium-free.
Please continue reading below the images.
All of the additional images below are an attempt at capturing the press lines of the glass.
The exact XRF test results for the diminutive child’s mug (or perhaps it is a punch glass from the type of set where the glasses were hung on hooks around the edges of a bowl?) pictured here were as follows.
Clear glass elements:
- Antimony (Sb): 319 +/- 21 ppm
- Bromine (Br): 16 +/- 3 ppm
- Copper (Cu): 1,363 +/- 84 ppm
- Iron (Fe): 313 +/- 119 ppm
- Vanadium (V): 64 +/- 19 ppm
- Titanium (Ti): 179 +/- 31 ppm
- Indium (In): 25 +/- 9 ppm
Metals not detected are not listed. Only the three metals listed above (and the four listed below) were detected with the XRF instrument. Tests were done for a minimum of 60 seconds each (in “Consumer Goods” mode) and results are science-based and replicable. Multiple tests were done on each component to confirm the results.
Red painted elements:
- Antimony (Sb): 315 +/- 24 ppm
- Bromine (Br): 15 +/- 7 ppm
- Copper (Cu): 31,500 +/- 800 ppm
- Iron (Fe): 216 +/- 106 ppm
- Vanadium (V): 69 +/- 30 ppm
- Titanium (Ti): 116 +/- 40 ppm
- Indium (In): 26 +/ -11 ppm
This little mug is a classic example of Lead-free vintage / antique pressed glass, (with the press line in the handle) which is helpful in identifying most similar items as likely Lead-free. While press lines are difficult to photograph they are easy to spot in a visual inspection, and can usually be felt (as a raised line on the surface of the item – simply by running your finger over the handle or other location of a visible seam in the item).
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