'When using linen spray, I advise a standard five-part patch test: on an inconspicuous fabric swatch, on skin, combining oils, with/without dilution, and after drying time,' recommends Keely Smith, lead interior designer at JD Elite Interiors.
'I've had expensive mistakes from ineffective patch testing – like when an undiluted blend ruined silk cushions! Proper testing saves homeowners stress and money in the long run.'