Aureolin 50g
An intense yellow that has high tinting strength and low opacity. It is an expensive pigment sold by several manufacturers of artists' oil paints. Learn more.
Cobalt yellow (commonly called aureolin) is a potassium or sodium-substituted potassium cobalt nitrite. The compound was discovered in 1831 but not introduced as a pigment until after 1851. It is However, the pigment never gained much popularity as an oil color and was much more widely available as a watercolor.
Water-Based Paint
In watercolors, cobalt yellow darkens and fades. It is a transparent, lightly staining, light valued, intense yellow pigment.
Oil Paint
In oil paint, cobalt yellow is transparent color with good tinting strength and is considered to be permanent.
| Color Names | |
| Current Names: | Dutch: kobalt geel English: cobalt yellow French: jaune de cobalt German: Kobaltgelb Italian: giallo di cobalto Spanish: cobalto amarillo |
Origin and History
The history of cobalt yellow pigment has been well documented by M. Cornman in 'Cobalt Yellow (Aureolin),' Artists' Pigments. A Handbook of their History and Characteristics, Volume 1, National Gallery of Art (1986). It is generally understood that cobalt yellow was first synthesized by N.W. Fischer in 1831 as part of his study of nitrite salts. However, Fischer did not describe the compound specifically until 1848. Meanwhile, Saint-Evre, working in Paris, independently rediscovered the compound around 1851 and introduced it as a pigment. It first appeared in Windsor & Newton's catalogs in 1861. According to Gettens and Stout, the pigment was reputedly made popular by the American watercolorist Aaron Penly and the German artist Arthur Mühlberg.
Source
According to Cornman, the principal method of preparing cobalt yellow was by mixing together solutions of cobalt salts with acetic acid followed by the addition of a concentrated potassium nitrite solution. Cobalt yellow would then slowly precipitate as a yellow crystalline mass.
Permanence and Compatibility
Cobalt yellow is slightly soluble in water and is darkened when mixed with sodium sulfide and caustic soda. In admixtures with organic pigments, such as lakes of cochineal, indigo, etc., it causes the decomposition of these; the organic colors become altered in hue and cobalt yellow becomes a brownish hue.
Oil Absorption and Grinding
Cobalt yellow absorbs a moderately high amount of oil; about 55 grams of linseed oil per 100 grams of pigment to make a paste. It has been noted in some manuals that the pigment works better as a watercolor than it does in oil, and is highly valued on that account among moist colors used by artists. According to Uebele it requires six parts of oil to four parts of the dry color on mixing and grinding.
Toxicity
Cobalt yellow is considered slightly toxic, and hence care should be used in handling the dry powder pigment to avoid inhaling the dust. Soluble cobalt compounds as well as cobalt metal may have a sensitizing effect. However, none have been reported during the experience of many years of handling cobalt yellow pigments.
Rublev Colours Pigment: Cobalt Yellow (Aureolin)
| Pigment Information | |
| Color: | Yellow |
| Color Index: | Pigment Yellow 40 (77357) |
| Chemical Name: | Hydrated Tripotassium Hexanitrocobalt(II) |
| Chemical Formula: | K3(Co(NO2)6).nH2O |
| CAS: | 13782-01-9 |
| ASTM Lightfastness Rating | |
| Acrylic: | II |
| Oil: | II |
| Watercolor: | II |
| Properties | |
| Specific Gravity: | |
| Refractive Index: | |
| Oil Absorption: | 55 g oil/100 g pigment |
| SKU | 437-1005 |
|---|---|
| Brand | Rublev Colours |
| Vendor | Rublev Colours |
| Processing Time | Usually ships the next business day. |
| Size | 50 g jar |
| Color | Yellow |
Order Processing
If the Processing Time for items in your order is "Usually ships within 24-48 hours", your order will usually be processed within 48 hours of receipt Monday through Friday. Orders received during weekends and holidays will be processed on the next business (working) day. Orders with longer processing times will be shipped when all items become available.
Shipping Rates
Please add your desired items and the delivery address to your basket to determine the exact shipping costs and options. The table below provides shipping rates for different weights to the countries we ship to.
Carriers
We use the following carriers to deliver orders:
 |
 |
 |
Below is an approximate guide to shipping costs for locations in Europe. Rates may change without notice.
| COUNTRY | ALPHA-2 | RATES PER PARCELS | CARRIER | |
| 0–10 kg | >10 kg–30 kg | |||
| Austria | AT | 11,50 € | 11,50 € | DPD |
| Belgium | BE | 10,95 € | 10,95 € | DPD |
| Bulgaria | BG | 20,25 € | 30,25 € | FedEx |
| Bosnia and Herzegovina | BA | 49,25 € | 49,25 € | DPD |
| Cyprus | CY | 21,80 € | 29,30 € | FedEx |
| Switzerland | CH | 25,85 € | 42,98 € | FedEx |
| Czech Republic | CZ | 12,00 € | 12,00 € | DPD |
| Germany | DE | 5,50 € | 5,50 € | DPD |
| Denmark | DK | 12,00 € | 12,00 € | DPD |
| Spain | ES | 17,48 € | 28,50 € | FedEx |
| Estonia | EE | 21,70 € | 21,70 € | DPD |
| Finland | FI | 17,48 € | 28,50 € | FedEx |
| France | FR | 14,60 € | 14,60 € | DPD |
| United Kingdom | GB | – € | – € | – |
| Greece | GR | 17,48 € | 28,50 € | FedEx |
| Croatia | HR | 29,25 € | 29,25 € | DPD |
| Hungary | HU | 15,90 € | 15,90 € | DPD |
| Ireland | IE | 17,48 € | 28,50 € | FedEx |
| Iceland | IS | 30,70 € | 62,40 € | DHL |
| Italy | IT | 15,90 € | 15,90 € | DPD |
| Liechtenstein | LI | 25,85 € | 43,00 € | FedEx |
| Lithuania | LT | 21,70 € | 21,70 € | DPD |
| Luxembourg | LU | 10,95 € | 10,95 € | DPD |
| Latvia | LV | 21,70 € | 21,70 € | DPD |
| Malta | MT | 21,80 € | 30,25 € | FedEx |
| Monaco | MC | 15,95 € | 24,30 € | FedEx |
| Netherlands | NL | 10,95 € | 10,95 € | DPD |
| Norway | NO | 25,85 € | 43,00 € | FedEx |
| Poland | PL | 14,90 € | 14,90 € | DPD |
| Portugal | PT | 15,50 € | 15,50 € | DPD |
| Romania | RO | 21,80 € | 30,25 € | FedEx |
| Serbia | RS | 49,25 € | 49,25 € | DPD |
| Slovakia | SK | 15,90 € | 15,90 € | DPD |
| Slovenia | SI | 15,90 € | 15,90 € | DPD |
| Sweden | SE | 15,90 € | 15,90 € | DPD |
| Turkey | TR | 27,30 € | 46,20 € | FedEx |
Note: Countries in RED type are not members of the European Union.
Postal Service
Shipping (EU and non-EU countries):
Up to 500 grams Tracked: 6,85 €
Up to 1000 grams Tracked: 10,45 €
Up to 2000 grams Tracked: 20,50 €
Tracking
For tracking details, please log in to your Natural Pigments account.
We track all orders where a tracked delivery service has been selected.
We will update your order with the tracking information if the shipping carrier provides a tracking number. You can locate the tracking number for your order in the shipping confirmation email you receive when your order is shipped. (Look for the email with the subject line "Natural Pigments: Shipment # xxxxxxxxx for Order # xxxxxxxxx.") You can also find the tracking number by signing into your account and visiting My Account Dashboard under Recent Orders.
VAT for Orders within the European Union
VAT is not included in prices unless specified on the website as VAT INCLUSIVE. VAT is calculated for Germany at 19% on both order subtotal and shipping cost and is added to the order grand total.
VAT, Duties, and Tariffs for Orders Outside of the European Union
VAT is not included in prices and totals unless specified on the website as VAT INCLUSIVE. Duties, tariffs, and customs broker fees are not included in the prices and totals on the website. These charges are in addition to what you will pay when ordering. These charges originate in the delivery country, so please contact your local customs for more information.
Shipping Rates
The rate charged for the shipping of your order is based on the weight of your products and your location. Before the final checkout page, you will be shown what the shipping cost will be, and you will have a chance to abandon your order if you decide not to place it.
Shipping Damage
For shipping damage, customers should file a claim with the carrier immediately. Any discrepancy, including wrong or missing items, should be reported to Natural Pigments within twenty-four (24) hours of receipt.
Back Orders
We do not accept backorders for out-of-stock items. If you order an out-of-stock item, we will email you when we expect that product to be available. You will be among the first to receive the item when it becomes available. Natural Pigments will not charge your credit card for out-of-stock items.
