Cover Grey Hair
Q: I'm starting to get a sprinkling of grey hair. Would it be possible to cover the grey with a blonde rinse and/or color?
You also want to make sure that you are using a deposit-only hair color since you don't want anything that will lighten the existing color of your pigmented hair. The goal is to color the gray so that it acts like highlights.
You can use a temporary rinse to accomplish this, but you have to remember that temporary haircolor only lasts until your next shampoo and rests only on the surface of the hair shaft. It can rub off on pillows, clothing and furniture in some cases, so you will want to be aware of potential staining issues.
You might want to consider using a semi-permanent or demi-permanent haircolor for this process, since these are not permanent, but last longer, meaning you would have more time between color retouching. These color formulas wash out gradually, usually over 6-12 shampoos.
After you've tested out the idea of covering the gray using deposit-only temporary or semi-/demi-permanent color you can use a permanent color in the same fashion to cover the gray and have more time in between color retouch services. Typically, haircolor retouch is done every 6-8 weeks, or when the new growth is sufficient that it becomes visibly apparent.
Hair colors and coloring
What is a temporary hair color rinse?
The differences between temporary, semi-permanent and permanent hair color