my brown roots are coming through my dark brown black coloured hair, any advice how to use to make it blue black?

I haven't actually used this yet. I got paranoid and bought a different brand from 'its pure organics' but to be honest the colour doesn't last too long I'd say 4-6 weeks depending on how much you wash your hair. I should be using this brand soon as my other one is about done. But to get the best colour out of it I used a heat cap with both applications of henna and indigo. Not sure if this helps with your question.

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Herbs And Crops Pure Natural Organically Grown Indigo Powder- For Hair (227G (1/2 Lb) 8 Ounces)

Herbs And Crops Pure Natural Organically Grown Indigo Powder- For Hair (227G (1/2 Lb) 8 Ounces)

Product ID: 52542161

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Details

Colour
Blue
Package information
Bag
Product benefits
Hair Coloring
Brand
Herbs And
Item form
Powder
Hair type
All

🌿100% Organic Indigo Powder

🧴Chemical-Free & PPD-Free

⚖️227g Premium Natural Dye

Description

🌿 Elevate your hair game with nature’s purest pigment!

ECO CHIC HAIRCARE - Certified organic and sustainably sourced—because your beauty routine should be as green as your values.
PURE BOTANICAL POWER - Harness the natural dyeing strength of Indigofera tinctoria leaves for vibrant, lasting color.
VERSATILE COLOR MAGIC - Mix with henna for rich dark brown to shiny black hues or use solo for a unique denim blue tint.
EFFORTLESS APPLICATION - Simple powder format designed for easy mixing and smooth, mess-free use at home.
ZERO CHEMICALS ZERO COMPROMISE - Enjoy a PPD-free, allergy-friendly formula that respects your scalp and skin.

Herbs And Crops Pure Natural Organically Grown Indigo Powder is a 227g premium, chemical-free hair dye made from organically cultivated indigo leaves. Ideal for professionals seeking a natural alternative to harsh dyes, it delivers rich black or blue tones and blends seamlessly with henna for customizable shades. Certified organic and free from PPD, it offers a safe, eco-conscious solution for vibrant, healthy hair coloring.

Specifications

Manufacturer	HERBS AND CROPS OVERSEAS
Package dimensions	20.3 x 15.2 x 4.4 centimetres
Package Weight	0.32 Kilograms
Item dimensions L x W x H	22.9 x 16.5 x 3.8 centimetres
Item weight	227 Grams
Brand	Herbs And Crops
Colour	Blue
Format	Powder
Speciality	Certified Organic, Free from Paraffins, Natural
Manufacturer reference	HNC-INDIGO
Product Dimensions	22.86 x 16.51 x 3.81 cm; 227 g
ASIN	B01BKIBVCG