You can find Invisafil 100 wt. Thread at SoftExpressions.com. It comes in a wide variety of colors and can be purchased in a six color pack. I have used the off-white on red, blue, green and other color fabrics and it is so fine that you cannot see the stitches. It runs rings around silk thread and it is very strong and does not break like silk and cotton can. Try it, you'll like it.