Auto-vanishing Ink is gradually increasing in demand owing to the re-fill efficiency and clean work process in garment sewing field.Ordinary chalk made from Paraffin looks disappeared seemingly if ironed by heat. But actually oil trace still remains between fabric structure. It can be fatal defects in quality control.Merit of Vanishing Ink - Ordinary chalk can cause problem due to easy breakage and residues. But Pen can increase high productivity owing to repeated Ink-Refill and clean work process. - Ordinary chalk can cause wasteful loss due to careless breakage and dust on the cloth fabrics. But this ink can provide high economic efficiency by re-filling 125Pcs pens/150ml 1 bottle. Blue ink has individual number according to the vanishing time. Choose your suitable ink number according to the fabrics. Number 1 disappears fast. Number 4 disappears slowly. Re ink has no number. It has been designed for footwear drawing.For industrial recycle purpose, Parts can be separately sold. For quick erasure, spray clean water on the marked area. Ink No. selection according to the fabrics No. 1 - Cotton, Linen with strong absorption No. 2 �T/C, wool with medium absorptionNo. 3 �Nylon, Acryl, Poly with weak absorptionNo. 4 �Silk with the strongest absorptio