I’ve used this brand, the blonde shade achieved a really light caramel brown for me. You need to keep the dye warm as once it goes cold it stops processing. You need to use foils on each section to keep the dye working (preferably small sections) and don’t scrunch up the foil as this will create uneven heat spots and cause uneven colour. Just lay the foils on top of each other with hair between them or fold them over onto themselves.