Jenie Yolland Glass Artist

Siena – 101 why is it called Sienna?

Earlier this week I was in a very upmarket dress shop filled with clothing that were either sandy coloured or beige or sienna and wondered what I could re-create in those colours in glass.croajingalong dunes (3)

 I put strips of a glass that has a white base and uneven burnt sienna, sienna, and raw sienna and beige amongst the white glass.  I added these strips to a clear base.I added some cream to the edge and a glass noodle in dark gold.  croajingalong dunes (5)

I started to wonder where Sienna the name came from, and found out from Wikepedia.  Here is some information about sienna if you are interested.croajingalong dunes (2)

Along with ochre and umber, sienna was one of the first pigments to be used by humans and is found in lots of cave paintings.

It takes its name from the city state in Italy called Siena, where it has been produced since the Renaissance.

The clay soil of Tuscany (here near Monteriggioni) is rich in limonite, or hydrated iron oxide, the main ingredient of sienna pigment.

The clay soil of Tuscany (here near Monteriggioni) is rich in limonite, or hydrated iron oxide, the main ingredient of sienna pigment.

Siena is an earth pigment containing iron oxide and usually approximately only 5% of manganese oxide.

In its natural state it is yellow brown and is called RAW SIENNA.   This pigment is known as yellow ochre, yellow earth, limonite or terra gialla.

Limonite, a clay containing iron oxide, which gives the color to sienna pigment.

Limonite, a clay containing iron oxide, which gives the color to sienna pigment.

When it is heated, it becomes a reddish brown and is called BURNT SIENNA.  It dehydrates the iron oxide, changing it partially to haematite giving it the reddish brown as you can see below.

Haematite. When limonite is roasted, it turns partially to haematite and becomes more reddish.

Haematite. When limonite is roasted, it turns partially to haematite and becomes more reddish.

The pigment is also knows as red earth, red ochre and terra rossa.

After being heated, the pigment has become the colour known as burnt sienna.

After being heated, the pigment has become the colour known as burnt sienna.

So having had a play with burnt sienna and raw sienna and some other ochre glass colours I came up with this simple design.

croajingalong dunes (5)croajingalong dunes (4)croajingalong dunes (1)

For more of my glass please visit http://www.etsy.com/shop/jensstudio alternatively you can find me on facebook 🙂

This entry was published on November 15, 2013 at 8:47 pm. It’s filed under Art glass platters and plates, Fused Glass Gift and tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , . Bookmark the permalink. Follow any comments here with the RSS feed for this post.

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