Caswell BLACK OXIDE CONCENTRATE 1 QT

Worked great when used as directed.

works well

As long as your steel is clean this will do wonders for your surface finish!

Works really fast when fresh - 30seconds. It's a 1:9 mix. One part blackening, 9 parts distilled water. As "stuff/contaminants" drop out of solution it may take 3 or 4 minutes. Filtering helps (400 sieve). A "splash" of blackening helps, but the solution is getting old.

Blackner works as expected

Good product. Works as intended.

Follow directions

Not as advertised. Photo showed a bottle and I received the liquid in a round 3” container. Very hard to pour without spilling. Container was delivers inside of a sealed bag and the cap taped with black electrical tape. (Seller was expecting it to leak or knew it would leak, unbelievable) Liquid still spilled/leaked in the bag. Was a mess opening. Due to the leakage, the label was ruined and no longer visible. Looked like a homemade sticker made on a low budget sticker maker. (Wish I would have taken pics) I have bought this product in the past and it work great. What I received was not as strong as what I used in the past. I think this product has been water down. I believe this seller buys this chemical in large quantities than breaks it up himself/herself. I would recommend buying from someone else. This is fishy… very unhappy and displeased.