How to Use Ultra-Blak 407-L
Ultra-Blak 407-L is a ready-to-use formula that can be used to blacken any stainless steel item or surface.
Use Ultra-Blak 407-L to:
- Give stainless steel parts sleek black finishes
- Work with a hot-temperature black-oxide solution
- Ensure dimensional stability
- Achieve superior abrasion resistance
- Give black-oxide baths an initial charge
- Meet MIL-DTL-13924D Class 4 standards
Ultra-Blak 407-L is a ready-to-use liquid solution that produces a black finish on stainless steel surfaces, offering dimensional stability and abrasion resistance.
Add 1–5 gallons per week per 100-gallon bath to replace chemistry consumed through drag out.
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Corrosive

Health Hazard

Irritant
How to Use Ultra-Blak 407-L
Ultra-Blak 407-L is a ready-to-use formula that can be used to blacken any stainless steel item or surface.
Use Ultra-Blak 407-L to:
- Give stainless steel parts sleek black finishes
- Work with a hot-temperature black-oxide solution
- Ensure dimensional stability
- Achieve superior abrasion resistance
- Give black-oxide baths an initial charge
- Meet MIL-DTL-13924D Class 4 standards