These are the instructions for Hennalucent Hair Toner and Conditioner:

1. Pour Hennalucent into a plastic or glass container or bowl. Add VERY HOT water (at or near boiling point), stirring constantly until blended to a smooth, honey-like consistency.

2. Let mixture sit a minute to stabilize. If it thickens, add more hot water. Mixture should remain creamy and moist during processing.

How to apply Hennalucent

1.  Apply hair conditioner along the hairline and wear gloves with all shades except Neutral to avoid staining.

2. Apply Hennalucent to moderately clean hair. If hair is very soiled or lacquered, shampoo and towel dry.

3. Use tint brush to apply Hennalucent generously to the parts, starting at the crown. Touch up the hairline last. Then, gently work mixture through the hair, making sure all ends are saturated.

4. Wrap a cotton strip around hairline to prevent dripping. No cap or foil is needed. DO NOT USE A HAIR DRYER.

5. Mixing Hennalucent shades can be mixed thinner to dilute the intensity of the shades, just by adding more water.

6. There's no color build-up with the hennalucent. Hennalucent fades out of the hair shaft naturally in about 6-8 weeks.

7. To determine the proper process time, see Hennalucent timing guide.

8. When desired results are reached rinse hair thoroughly with warm water. Then shampoo with a mild shampoo.

9. Suggest a mild shampoo and conditioner to prolong the benefits of Hennalucent between salon visits.

Note: To insure color continuity and superb conditioning, apply every 4-6 weeks.

Cautions: Do not use in the area of the eye. Do not use on cut or abraded scalp.

I don't see anything that talks about natural hair, but --->

Straightened or relaxed hair:

To restore elastic body and shine to relaxed hair, follow immediately with a Hennalucent conditioning treatment. Select shade and process 20-45 minutes depending on color intensity.