at the backwash

07:02 Feb 12, 2020 

To apply a full-head Semi or Demi-Permanent colour at the dress out unit (mirror), from roots to ends using the 6 or 4 Field Application with an application bottle or bowl & brush.
B:
To apply a full-head semi or demi-permanent colour at the backwash, from roots to ends using the 3 Field Application = T- section with a bowl & brush or applicator bottle.
Application technique - dependant on hair density:
High Density = 6 Field Technique.
Low Density = 4 Field Technique ( Cross section), 3 Field Field Technique (T-Section)

06:58 Feb 12, 2020 

А где эта фраза "at the backwash" - в тексте?