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Depending on how dark your hair is, the process of lightening your hair goes in stages; from red to orange to yellow and even lighter. If your hair is very dark and/or you wash out the bleaching too quickly, your hair can indeed become too warm in colour or even orange. You should then dye with hair colour in a shade in the same colour level. For lighter blonde hair that is still too warm in colour, a toner is often sufficient.
Also check the FAQ "How much lighter can I go with WECOLOUR bleaching?".