How to identify pure cotton with only touch and feel

Simple, reliable methods to determine whether a fabric is pure cotton or a cotton/polyester blend (polycotton):

1. Visual and tactile clues (quick screening)
   - Pure cotton: matte appearance, soft and warm hand, wrinkles easily, feels breathable; edges/frayed threads look fuzzy.
2. Burn test (fast, inexpensive, widely used)
   - Cut a small, inconspicuous sample (or a loose fiber). Use tweezers and a metal dish; work in well-ventilated area and have water ready.
3. Chemical solubility tests (more accurate, lab-level)
   - Specific reagents dissolve particular fibers: e.g., sulfuric acid (at controlled concentration) dissolves cotton/cellulose but not polyester; some solvents dissolve polyester but not cellulose.
4. Microscopy (definitive for fiber ID)
   - Light microscope at 100–400×: cotton shows twisted ribbon-like (convoluted) fiber morphology; polyester appears smooth, uniform, rodlike with cross-section consistent lengthwise.
5. Professional laboratory testing (most reliable)
   - Accredited textile labs use microscopy, FTIR (infrared spectroscopy), or thermal analysis to quantify fiber percentages. They provide certificates and precise blend ratios (e.g., 60/40 cotton/polyester).
6. Practical field approach (recommended for consumers)
   - Start with visual/tactile check, then do a controlled burn test for a likely answer.

Safety and ethics

• Perform burn tests in safe, ventilated area with fire extinguisher/water. Avoid damaging valuable garments; test on a seam allowance or hidden hem. Follow local disposal rules for chemical tests.

Summary

• For a quick home check: visual/tactile cues plus a controlled burn test.
• For definitive identification and quantification: microscopy, FTIR, or an accredited textile laboratory analysis.