Quarter Square Triangles

Who do you know that has more half-square triangles than me?? Come on! There must be someone! Well, I sure would like to meet them! I think I have an awful lot of them. It comes from demonstrating my Stitching Lines at quilt shows. I can't seem to use them up. I think they reproduce when I'm not looking. And some of the squares have gotten together that never should have met up. I can't even show you the really bad ones. They are punished and sent to the trash bin!! Quarter square triangles use up two Half-Square Triangles! Yipee!! That's two gone! My half-square triangle supply is made with 3-1/2" squares. Some I have already squared up to 3". But they work just fine when paired up with untrimmed HST's. Another Yipee! I take two HST's that look good together, press seams to the dark, stack them right sides together, with dark on light. I pin the two ends of the seam, and lay a small strip of Stitching Lines on top. I line up one horizontal dotted line with the seam line on the top HST, and try to line up the center-line of strip with the corner points. I stitch on the two dotted lines.

Next, I tear away the sides of the Stitching Lines and cut on the solid line. I leave the small 1/4" remainder and press against it.

Then I square up the quarter square triangle to 2-1/2".
All done. Two HST's gone and now I have two quarter square triangles.
OOPS. What happened?
Not only do my HST's reproduce.
Now they change color on me. What's up with that?? All finished and looking good!