Can you use 10 and 20 developer with a 10n blonde color?

Yes, you can use a 10 or 20 volume developer with a 10N blonde color. A 10 volume developer is typically used for depositing color without significant lift, while a 20 volume developer can provide a bit more lift and is suitable for gray coverage. However, using a 20 volume developer may lighten the hair slightly more than desired, so it's best to consider the desired outcome and hair condition before deciding.