Black film

{
  "id": "MLC-T-CHM-001356",
  "term": "Black film",
  "field": "Chemistry",
  "definition": "A thin liquid film that appears black when viewed by reflected light because its thickness is much smaller than the wavelength of visible light, causing destructive interference between light reflected from its front and back surfaces. These films form as a liquid lamella, such as in a soap bubble, thins by drainage. A Newton black film is a specific type where the two surfaces are in close contact, with a thickness of about 5 nanometers.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "Newton black film",
    "equilibrium film",
    "film",
    "ionic strength",
    "soap",
    "visible",
    "wavelength"
  ],
  "references": [
    "PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 614 (https://doi.org/10.1351/pac197231040577)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/black-film/"
}