Madeira Smocking Thread 200m Madeira Heat Reactive Smocking thread 200m. This is the third in the series of Madeira's Special Effect Threads. Smocking is a heat reactive thread that shrinks when an iron is drawn over it, whereas the fabric does not, causing the fabric to pucker in a controlled way. The wrinkled effects are beautiful and limitless. How it works" Stick with a simple design that consists mostly of run stitches and have a lot of negative space. To make the embroidery 'shrink, or puff up' the thread needs to be exposed to heat. With a steam iron, turn the fabric over to the WRONG side, bobbin side up with a light pressure, iron the reverse. If you use heavy pressure you will achieve a 'wrinkled' effect. 200m reel. A special thread which reacts to heat to create fabric puckers Use it for embroidery or decorative stitching Slowly draw the iron over the fabric The thread shrinks but the fabric doesn’t, causing a controlled puckering Fabric puckers in a controlled way No special iron or needles are required Suitable for all domestic sewing and embroidery machines Recommended needle: Sewing needle NM 75-80 Product Details: Name: Smocking Art. No.: 9662 Use: Sewing Material: 100% Polyester Makeup: 200 m Snapspool Colors: 1