In Finland, window glass was blown until the 1930s. The thickness of these glass panes was about 1.5 mils. For a long 19th century, glass was made only from domestic raw materials and because of that, the glass was greenish due to impurities in the sand.
The brinks are also interesting. Fiskars Village, has two two prominent buildings on the riverbank, each with a striking red-and-black brick exterior. The mill and granary, built in 1898 and 1902, respectively, were constructed from a combination of traditional red bricks and unique black bricks. The secret ingredient of these black bricks was slag, a smelting byproduct created by the blast furnaces of the ironworks.
Ritva Sillanmäki Photography 
The variety of colors in these photos are beautiful!
Thanks Frank, small details show the colors nicely.
The windows make for lovely photos, but they probably weren’t too good for looking out. What beautiful brick work in these shots.
I think time has added more green to them in time, but the view would be rather hasy green 🙂 Janet 🙂
These are beautiful. The sun shining through that green glass must be gorgeous.
I haven’t seen them from the other side Lois, but it would surely have a great effect , now that I think of it.
Love those windows in Fiskars!
Thanks Sue, so due I 🙂
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Nice shots of these beautiful windows.
Thanks 🙂 Rudi!
Beautiful pictures, and a very interesting post, Ritva. We have black bricks made from slag on an old building here in Bristol too. 🙂
They are beautiful, the colors that you can see in the black bricks,
your photos are so good!
Thanks, glad you enjoyed them!
Thanks, glad you enjoyed them