Permanent shades contain ammonia

Demi-permanent shades contain AMP

When chromastics permanent shades are mixed and applied to the hair, there is less than 1% ammonia in the mixture.

The exception is XL-C, which when mixed contains less than 2%.

When mixed with 20 volume developer, levels 8 and 10 will lighten up to
3 levels depending upon the texture and depth of the hair.

When mixed with 20 volume developer levels 4 and 6 will lighten up to 2 levels depending upon the texture and depth of the hair.

When mixed with 20 volume developer, XL-C will lighten up to 3 levels depending upon the texture and depth of the hair. 40 volume will increase the lightening to approximately 5 levels.

Demi-permanent colors are used for deposit only and are mixed with 10 volume developer.

No. Either Neutral or Gold can be used by itself for gray coverage.