$9.24
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Please note this is a raw pigment intended to be dispersed into a liquid medium to make paints. Our raw pigments are not meant for use in cosmetics and are not cosmetic grade. Certain pigments disperse more easily than others in certain liquid mediums. For those difficult to disperse into a liquid of your choice, they will need to be ground by a muller or a mortar and pestle into the medium.
Safety note: Handle all dry pigments with care. Work slowly to avoid generating airborne dust and wear a dust mask for extra protection. Also avoid getting the dust all over your hands. Latex gloves are good at providing skin protection without "getting in the way".
Crocus martis is a rather obscure red ceramic or paint colorant. What it is depends on the source. For all practical purposes you can think of it as a darker, earthier red iron oxide. It's similar to our "Red Iron Oxide, Natural", but darker, and with more "impurities".
Below are various descriptions gathered from the web. The consensus opinion seems to be that historically it was just a red iron oxide with lots of impurities and that today it is most likely a calcined impure iron sulfate or a red iron oxide with impurities such as iron ore and/or other clay minerals:
First, from the Digital Fire database of ceramic ingredients, which I tend to hold as the most authoritative source for ceramic materials. An example of that is they are the only ones who say that what it is varies, (below):
{ https://digitalfire.com/4sight/material/crocus_martis_249.html } :
"Crocus Martis
Anhydrous Ferrous Sulphate FeSo4, Calcined Copperas
Has been used in glazes as a substitute for red iron oxide.
There are varying ideas from country to country about what this material is. Historically it was just a naturally-occurring red iron oxide containing impurities (i.e. clay minerals) or an ultra-high iron clay. Today, Crocus Martis sold by ceramic suppliers is more likely to be a soluble synthetic impure red iron sulphate or a calcined-at-900C version of the sulphate (it is insoluble). This material is not normally highly processed and therefore can produce iron specking in glazes. Normal iron oxides can be used as a substitute (although less will be needed since this material has a significant weight loss during firing).
Sulphur is released during firing and it does not decompose fully until as high at 1200C."
{ http://en.termwiki.com/EN/crocus_martis } :
"A name used for impure red ferric oxide pigments and polishing powders, usually produced by heating iron sulfate containing calcium sulfate, lime, or other inert filler. Also sometimes applied more generally to other impure oxides of red or yellow color."
{ https://www.theceramicshop.com/product/361/crocus-martis/ } :
"Crocus Martis is the trade name for anhydrous ferrous sulphate (FeSo4) and is also known as calcined copperas. This is a material that has traditionally been used as a substitute for red iron oxide, and is often not as soluble as iron oxide -- as a result, this can result in specking in glazes, which may be a desirable effect for some. Please note that this material releases sulphur during firing, and may not decompose completely until 1200C or higher.
Historically this was a natural occurring mineral with varying chemical compositions. Now it is a commercially reproduced to approximate an interpretation of the natural mineral. Because of this, we recommend testing each glaze recipe mixed with this commercially developed version."
{ http://www.potters.org/subject02430.htm } (Some comments from a ceramics forum):
"Crocus martis is an iron oxide pigment which is made by calcining Ferrous Sulfate. It is probably a mix of several iron oxides. The main commercial uses are for mineral pigments and for fine polishing of metals & glass. IMOH, it is probably an expensive substitute for the potter's Iron Oxide."
"Crocus Martis originally was a natural-occurring iron III oxide (red), perhaps a tad hydrated, mixed with a lesser amount of clayey materials, which would alter its colour. Today, Crocus Martis sold by suppliers is likely to be synthetic red iron oxide, but a relatively impure grade."
"Crocus Martis has historically been a simple natural-occurring red iron oxide containing impurities (clay minerals) Today it is more likely to be a synthetic impure red iron oxide."
Iron oxide is a very ancient pigment and there are many varieties. It finds applications in paint, ceramics, and resins (as a colorant and filler). It finds applications in paint, ceramics, and plastics (as a colorant and filler). Used for many things besides a pigment and filler. There are 3 main types (Fe2O3, FeO, and Fe3O4), and 3 main colors (although it is found in many shades of these): black, red, and yellow. Other well known pigments based on or containing iron oxide are yellow ochre, burnt umber, and raw sienna.
The Wiki article is here (Iron(III) oxide = red iron oxide):
https://en.wikipedia.org/wiki/Iron(III)_oxide
"Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare, and iron(II,III) oxide (Fe3O4), which also occurs naturally as the mineral magnetite. As the mineral known as hematite, Fe2O3 is the main source of iron for the steel industry. Fe2O3 is ferromagnetic, dark red, and readily attacked by acids. Iron(III) oxide is often called rust, and to some extent this label is useful, because rust shares several properties and has a similar composition."-
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Nov 18, 2024
Looks like quality pigment powder to me! Thanks!
Mathew Hricko
Jan 7, 2023
Maurice
Oct 19, 2022
Soooooo. I came to this shop thinking I knew what I was looking for. I made a purchase, got paranoid, reached out to the seller and started asking questions (after the fact) and not only was the seller super informative on the product but he informed me that I ordered the wrong thing, explained to me what I ordered & how to use it and how I could possibly use it for my project. I was also given a recommendation to where I could go and purchase the right product for my project, not only that, I was offered a refund. After seeing "no refunds or exchanges" on the sellers page I thought that was super generous. Excellent customer service makes you want to support a business more and it makes me want to buy something just to buy something lol
Octavia Dantignac
May 25, 2022
Pigments are smooth and gorgeous. This one makes a rich sienna that separates a bit. Exquisite 🤓🥰
M Mills
Nov 28, 2021
Melissa Thomson
