Purple, Rose Red Iron Oxide Powder, Concrete Dye Powdered for Concrete, Cement, Mortar, Grout, Plaster, Colorant, 2 Colors Iron Oxide Pigment Powder - 4 Ounces

These are really bright concrete dyes, though they lose a little vibrancy unless you use a lot. But that's normal for these sort of dyes. Overall these are great, high quality dyes and no complaints.

Quality: Extremely vibrant colors and super pure powder! For the price it's a great product, with each bottle holding 4oz of powder. I've used these in a few science experiments with great success.Functionality: As mentioned, I used these for science projects, while they aren't "lab grade", it's still pure FE2.Overall: The design of the bottles and the specifications of the iron oxide allow for great ease of use. I would highly recommend this product for scientific or staining needs.

Packaging is very good for this company. Not only are each wrapped in plastic but they are then in a sealed bubble wrapped envelope. Not a drop of powder escaped in the process. These are two very vibrant colors and will go nicely with the other vibrant colors for my steppingstones.

This is a review for "Ninesung Purple, Rose Red Iron Oxide Powder, Concrete Dye Powdered for Concrete, Cement, Mortar, Grout, Plaster, Colorant, 2 Colors Iron Oxide Pigment Powder - 4 Ounces"The directions say to use anywhere from 3-10% pigment powder to cement mix (or whatever you are mixing this into presumably.) I used mortar mix and poured my mixture into silicone molds used to make my own rocks, so I can then paint them. I figured giving the cement some color of its own will speed up the base coating step. And I was right!I just wish I were better at match. The mortar mix is 2 to one ratio. I can handle that. Having to guesstimate at what 3-10% is/was a pain. I admit, I winged it. BUT, I am making rocks for my own use and not for a commercial application, where it needs to be more exact.The colors do dry lighter than they appear when wet. I'm not sure how to describe how much lighter, so you have an understanding though. Maybe 50% more muted. The directions above say that once you pass a certain point, you won't see a noticeable difference. So try a test batch first, if the thing you are working on, you only get one shot.For my use, this pigment did not effect the way the mortar behaved, so that was good.

Great colors pink and purple. Easy to use in epoxy art. Great multipurpose pigment powder. I like using it with my arts and crafts. Easy to use and great to work with. Great quality and good amount in the jar. Love these colors

These are very pretty colors. I intend to use these to tint small cement planters.As far as the claim that these are solely iron oxides--that's simply impossible. I'm a painter--and a pigment nerd. Iron oxide is widely used as a pigment, but its color ranges from a brown-pink to orange to brown. Iron oxide IS rust, so it produces mostly an earthy rusty color. It does not make bright pink or purple like these two colors. So while there may be iron oxide IN this product, that's not all it contains. It likely contains a dye that can survive in an alkaline environment as well--and I would prefer that they'd just call it that to be more accurate. I'm guessing that this is a translation error.Be sure to wear safety equipment when working with this powder until it's fully dissolved in your media. (You should do that with EVERY powder you work with--finely ground stuff is easy to inhale without realizing it and it's very, very bad for your lungs.)These were packaged well for transport and were not leaking on arrival--a common problem when shipping dyes and pigments.Currently there is only one other review for this product that complains that the color lightened as their media cured. That commonly happens with all dyes and paints in virtually every application--colors shift slightly when they cure or dry. Wet things are usually darker. That's how it works. That is not a reason to ding a product like this. Always do a small test and adjust accordingly.Regarding their complaint that they are bad with math and can't figure out 3-10%… that sounds like a "they problem." It's common practice to weigh and have to do math with products like this. The manufacturer cannot simply make a statement like add 1 tsp per cup because the media this product is being mixed into makes a huge difference. If they aren't happy with their outcome when they eyeballed it, then they need to learn basic math skills. I'm sorry if that sounds harsh, but it's silly to purchase a product one knows nothing about and then complain when it works as intended.These are priced very fairly for this kind of product.