Here is a terrific explanation and illustration of "foil-ayage" from @katieclairedoeshair on Instagram.
"Look at this beauty! If you're wondering what a foil-ayage looks like, look no further. This cute mama came in wanting to be blonder. When people want low maintenance but a higher lift, foil-ayge is a perfect route to take. Foils = higher lift. Balayage = low maintenance. Foil-ayage = PERFECT." (Editor's note: We used 'perfect' but she used a much cuter emoji to express herself here.)
2. She processed at room temperature and then we toned with Redken 10AB & 12AV (to even out the blondes) and then glazed over that with SEQ 9P, 9N & 9T.
"So in love with that shine (thanks @olaplex!) and that natural ash blonde tone."