Shipping & Delivery  |  Purchase Orders  |  About Us  |  Contact Us Place order online or call 1-800-929-2431
Artist Supply Source
Product search » Pigments » Raw Materials » » » Natural Pigments Formaldehyde 8 fl oz

Natural Pigments Formaldehyde 8 fl oz

SKU : NAP-500-21FHS08
The minimum order amount for this product line is $30.00
Natural Pigments Formaldehyde 8 fl oz
Discount table
Qty Price
 1   US$ 11.83 
Price: US$ 11.83
Quantity: Out of stock

Product description


Formaldehyde (also called Formalin) is a 4% solution of formaldehyde to harden gesso and chalk grounds and glue sizing on canvas or panels. The spray bottle has a fine misting pump spray. Spray formaldehyde solution onto freshly applied gesso or chalk grounds made with collagen glue (animal or fish glue) as the binder. Formaldehyde is recommended by Kurt Wehlte and Ralph Mayer to harden surfaces made with animal or fish collagen glue.

Directions of Use

On Size

  1. Place the support (panel or canvas) upright or vertically.
  2. Spray the formaldehyde lightly over surface of the size after it has been applied and before the priming coat is laid on.
  3. Distribute the coat of formaldehyde as needed to coat the surface evenly using a flat bristle brush or sponge.
  4. Reserve the brush or sponge for this use only. Do not use the same brush used to apply the size.

On Grounds

  1. Place the support (panel or canvas) upright vertically.
  2. Spray the formaldehyde lightly over surface of the final layer of ground, careful to avoid applying excessive amounts that drip down the surface of the ground.
  3. For canvases, spray the front and back of the canvas.
  4. Distribute the coat of formaldehyde as needed to coat the surface evenly using a flat bristle brush or sponge.
  5. Reserve the brush or sponge for this use only. Do not use the same brush used to apply the gesso or chalk ground.
Hardening the Ground

When painting or underpainting with watercolors water-base tempera, any normal absorbent ground will soften or even partly dissolve. The alum content of the size will not be able to prevent this entirely. The ground should therefore be hardened. It is achieved by a six percent solution of Formalin lightly applied to the horizontally placed surface with a soft-bristle brush or rectangular sponge. A specially marked brush should be kept exclusively for this purpose, because any brush that is also used for priming is certain to harden irremediably in time. In order to expose all layers to the action of the Formalin, one can harden the size coating of the support and the final ground layer. However, if lower layers soften during the priming of large areas, causing the brush to drag and making an even application difficult, one may at any time harden each layer as necessary. This takes very little time and is best accomplished while the [sic] support is lying on the floor. It is advisable to leave the room before the gas affects the mucous membranes of the eyes. There is so far no chemical that can reverse the tanning action of Formalin. Once a ground has been hardened with it, it can no longer be washed off and can be removed only with sandpaper.

Hardened grounds naturally show a greater resistance to moisture, even later on, and are thus a major factor in prolonging the life of the painting. Although the practical effect of hardening resembles somewhat that of an isolation when aqueous paint systems are used, the absorbency of the ground is in no way affected by Formalin. Its hardening action is a chemical process that leaves no isolating substance, such as a resin, in the ground. It should also be pointed out that watercolor and gouache, which are bound with vegetable gums, cannot be rendered water-insoluble with formaldehyde. Only animal proteins are affected by its tanning action.

Kurt Wehlte (1975). The Materials and Techniques of Painting. New York: Prentice Hall. pp. 359-60.

The best hardeners belong to class of completely volatile materials (ketones and aldehydes) of which formaldehyde is the most widely used example; the best hardener for casein, glue, or gelatin is a 4 percent solution of formaldehyde, which is brushed or sprayed directly onto the film.

Ralph Mayer (1991). The Artist's Handbook of Materials and Techniques. Fifth Edition. New York: Viking Penguin. p. 487.

Natural Pigments

Natural Pigments is a limited liability company based in Willits, California. We manufacture and distribute rare and hard-to-find materials for fine artists and decorators. We specialize in supplying artists' materials that were used in historical painting since pre-historic times up to and including the nineteenth century.

We constantly search for materials and products of the finest quality so that we can bring them direct to you from the source. To do so, we travel the world to find materials specifically for use by professional artists and decorators. We obtain minerals from mines in Afghanistan, Chile, Russia, Ukraine and Uzbekistan, to name a few places, processing these into natural pigments. We purchase resins, gums and plants from India, Kenya and Malaysia to make natural varnishes and painting mediums.

Our mission is to provide the largest variety of natural pigments, paints and other professional artists' supplies, enabling us to bring you a selection that makes shopping for rare and hard-to-find art materials easy. Our objective is to promote the education and use of these materials among artists by providing detailed information for their employment in encaustic, fresco, oil, watercolor and tempera painting.
All products

This product is shipped from our warehouse in Gretna, NE, USA.
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
Please submit your product question using this form. All fields are required.

Your First name: *
Your email: *
Your phone: *
Product question:
Please don't mention your email and your phone in this field.
Submit question

Detailed images
Formaldehyde (8 fl oz)

Web Orders
24 hours a day, 7 days a week

Email Support
Contact Us

Telephone Customer Service
Mon-Fri: 9 a.m. to 5 p.m. EST
Toll Free: 1-800-929-2431
Tel: (616) 259-5711
Fax: (813) 944-4516

USA Address
S3 Stores, Inc.
2885 Sanford Ave SW #12717
Grandville, MI 49418

Canadian Address
S3 Stores, Inc.
27 Joseph St.
Chatham, Ontario N7L 3G4

Payment Methods
We accept all major credit cards
Purchase Orders
Combating eCommerce Frauds
Copyright © 2005-2018 S3 Stores, Inc. All Rights Reserved.    Terms of Use | Privacy Policy