Tactile Labels - Stock-Xpress.com (Tactile Triangles) In the EU, all chemicals and hazardous substances that are sold to the general public, that are labelled 'toxic' 'very toxic', 'corrosive', 'harmful', 'highly flammable' or 'extremely flammable' must, by law, have a tactile warning label to alert the blind, or partially sighted, that they are handling a dangerous product.