Hello Brenda, I have just dug out my gimp, added to the information I gave this morning, also on the actual label it says it is a cotton thread, and also has Article No. F199M. On the tube that the gimp is wound, there is a little more information it is 200m, colour is white and then No.12 BLQ.
At the time I attended tailoring classes, the lady that taught us was well known locally and a local but very small haberdashery shop stocked the necessary items that were needed for tailoring, like shrunk duck, linen stay tape, this gimp and possibly anything else that we were likely to use during the course. Of course this is many years ago, and I have no doubt that the teacher has now passed on as she was quite elderly at the time, and the shop again no longer like so many of the fabric and haberdashery shops.
I was taught how to sew bound buttonholes when I was still in school, and these were stitched on the old black singers that we had, and we had to count the number of stitches we did on each part of the buttonhole and they had to be same
on each long side and each short side, one too many and it had to be undone.
Now many, many years later with our lovely modern machines I love stitching corded buttonholes, makes for a lovely neat buttonhole, and I use Perle embroidery thread mostly white and No.5, but I make sure that I close the stitches right up and regardless of the actual colour of the sewing thread used the white perle thread does not show through at all.
I must admit I have often looked for this Glace Gimp when out shopping but have never seen it, so my precious gimp is used very sparingly. Possibly somewhere like Empress Mills may do something like this, but I have never bought anything from them.