For a good lab dip, send a physical fabric swatch of at least 5 x 5 cm, not a photo. If you use Pantone, state the full TCX code and the edition. Say which fabric the colour has to be made on (single jersey, rib, interlock), because the same shade looks different on different structures.
Also state the lighting under which the colour matters (for example D65 daylight) and the tolerance you accept. If your sample is made of a different fibre, say so: the dyehouse needs to know whether the same shade is possible on cotton. At Alteks, a lab dip to your sample or Pantone can be requested for made-to-order production.
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