When sourcing Guipure Lace (also known as chemical lace), you must prioritize material composition, typically 100% Polyester, Cotton, or Milk Silk. Pay close attention to the embroidery density and stitch tightness; high-quality Guipure should have a substantial weight (GSM) and no visible loose threads. Ensure the water-soluble non-woven backing used during production has been completely dissolved to prevent a stiff hand-feel. For high-end fashion, verify the tensile strength of the connecting 'bridges' between motifs to ensure they do not snap under tension.