This morning, Tamsin from Berrima Patchwork posted the following picture on their Facebook page:
She asked what colour the thread is – given that it looks brown, and she’s going to use it on a brown quilt, but it is not brown. She gave the helpful hint that it is made of two colours together. So what two colours do you think it is?
You can post your response here, and also use the link above to comment directly on the Berrima Patchwork Facebook page.
We might use this as a starting point for some discussion of colour theory. 
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White Threads is the blog of Yvette Stanton, the author, designer, publisher behind Vetty Creations quality needlework books and embroidery products.
it looks like a silk thread and is probably a brown/beige twist. because of the reflective quality of the thread it could be a twist of purple and cream
Looking at my colour wheel, I knock my head against the desk in confusion at what makes brown. I also think there’s a cream twist thread in there.