Carborundum Printing Intro Course

Saturday saw our first post-lockdown Printworks course with day one of ‘Intro to Carborundum Printing’.

The ‘Carborundum’ process (developed in the 1930s and onwards) is in essence the application of a mix of thick ‘impasto’ (paste) acrylic binder and Carborundum powder (very fine hard Silicon Carbide grit) onto the surface of a metal or plastic printing plate. The mix is worked and spread out on the smooth surface of the plate, allowed to harden over 24 – 48 hours, then inked and printed as a deep intaglio collagraph print. The results are often unusually stunning with their rich tones and their capacity for creative colour inking.

The Carborundum powder creates an amazing range of textures which have great capacity for holding ink. The thickness of the mixture, hardness of the grit and effects of brush or scraper to create marks and strokes in the mix all contribute to a very rich and varied inking surface.

Printing these plates onto well-dampened rag paper under a high pressure etching press results in a very striking range of ink tones together with an incredibly lively print texture. The toughness of the grit/binder mix allows for medium editions with good plate life: editions of between 10 and 30 are often very successful and retain great freshness of tone and texture.

Pre-mixing the ink (usually oil-based etching inks) with a very large proportion of oil-based extender allows under-colour to show through and creates some stunning colour mixes with two to four colour plate printing.

In this two-day intro course we will explore the practical and creative use of this versatile and tactile medium to create some large, lively and very expressive prints.

This two-day course is now fully booked up but we will definitely be running a further weekendnder or other two-day Carborundum course in the very near future. Please get in touch if you are interested in this enjoyable and very versatile print process!


Day 1

  • Principles of textured collagraphy
  • Overview of the Carborundum print process
  • Examples of Carborundum prints
  • Some images inspirations (sketching for Carborundum *)
  • Grit size, consistency, ways to apply the Carb/Gel mix
  • Using templates and light box
  • Spreading, combing, brushing and gestural forms
  • Stencils, silk screens and pressed-on textures
  • Gel viscosity and water content: working wet and dry
  • Curing our plates

The first day will start with a review of how Carborundum printing relates to other intaglio work and what makes it such a rich and enticing process…

We will look at the main stages of the process from prep to plate to print so we see where we might be heading…

Then we start mixing up our gritty gels and making sample plates of our own using brushes and spreaders: getting a feel for the material in its sticky state, celebrating its adhesive and drying qualities.

As the day progresses we will experiment with different ways to apply our gel surface, making brush and spreader marks with it.

We will go on to use masking tape, paper /film stencils (plus old silk screens) to create and shape areas of even, almost ‘mezzotint’ tone.

We will see how to manipulate and mark into these slowly drying surfaces to create drawn or impressed images, patterns, textures and tones. And we will see how useful it can be to have a lightbox so we can work over a base drawning or photo, manipulating, working up and wiping off areas of the sticky grit gel before they dry.

By the end of day #1 we should have a very interesting array of small test plates plus a couple of bigger plates that we will dry and harden ready for some enterprising inking-up and printing when we hit the second day!

Day 2

  • Plate handling
  • Ink and extender
  • Inking up/blotting off
  • Paper, wetness and press pressure
  • Overprinting
  • Hybrid print processes
  • Cleaning up

We start day #2 by handling and looking at our cured plates.

Carborundum plates have a very dense texture. This means they take up masses of ink. They also have a slight relief surface. So inking up with pure etching inks would normally cause our plates to stick to the paper and even tear its surface off.

Pure etching inks are also very rich in pigment, so it’s important to mix up our inks with LOTS of extender. A safe recipe is 20% ink to 80% extender (even 10% ink to 90% extender). Mixing hint: start with a FINGER of extender and add a TINY bit of ink at a time! The extender loosens the ink, makes it more translucent and prevents paper surface tear.

We will make up some coloured inks as well as blacks. One great beauty of Carb printing is its capacity to overlay two or three translucent layers of saturated colour on top of another. We mix up and apply our extened inks, blotting off the surplus, rubbing in and then wiping around our textured areas. In this process we use a lot of tissue to blot off the ink, rag (to wipe clean the clear areas of the plate), and we use  CLEAN scrim (unlike in some metal plate inking) to wipe in and off our ink .

We will proof our test plates, experimenting with colour and tone overlays, printing multiple plates in quick sucession to avoid paper dry-out and registration issues.

With our larger plates we will fine-tune paper moistness and press pressure, making two or three-colour prints.

And we will if time permits try combining our Carb plates with simple monoprints or quick drypoints for some interesting hybrid effects…

By the end of day #2 we should have achieved a range of test proofs and produced some very saturated colour/tone overlay prints showing the rich surface and translucent colour results typical of this very tactile deep intaglio process.


Some resources

Inspiration images:

John Wallett and James Anderson
Mixing/Applying Carborundum Grit and Tempera Paste / Gel at Wivenhoe Printworks 2021:

James Anderson slideshow
Printing two-colour Carborundum Prints at Wivenhoe Printworks 2021:

James Anderson (contact details)
email: jba@katrinaer

Susan Rostow (developer of Akua inks) Carborundum Mezzotype prints

Susan Rostow on using Akua Carb Gel to create pattern-rich intaglio prints

Howard Hodgkin Carborundum Prints


James Anderson: Carborundum Prints

Today we had a visit from printmaker James Anderson to test out the big press doing some Carborundum Prints.

The process in essence is to apply a mix of acrylic binder and fine Carborundum powder to the surface of a metal or plasTic plate, let it dry and then ink and print it as an intaglio collatype print. The Carborundum powder creates a range of textures which have great capacity for holding ink. The thickness of the mixture, percentage of Carborundum to binder and the effects of brush or scraper to create marks and strokes in the mix all contribute to a very rich inking surface. Printing this onto a dampened etching paper with a medium-high pressure results in a striking range of ink tones. Pre-mixing the ink with a very large proportion of oil-based extender allows under-colour to show through and creates some stunning colour mixes. The images here are the inking and printing stages, and show the beautiful saturated colours and the textures achieved with this process.

In July we plan to get James to return and do a demonstration of this fascinating process from the beginning: preparing the Carborundum mix, making the plates, inking and printing. We are sure that this demonstration will be of great interest to Printworks Members.

Further details
James Anderson
mobile: +44 7786 266 815

Display Boads to Hire


For some time here at Printworks we have been using the very versatile ‘Klemetric’ clamps with 8’x4′ MDF boards to put up extra display areas when we do occasional workshop shows. A pair of white emulsioned 15mm or 18mm boards and a pair of these great clamps and you have a nice, unfussy display surface you can screw, nail or glue to. The clamps are like super strong hinges and can be adjusted to any angle between 90 and 270 degrees. You can create flat display walls, zig-zags, corners, square or triangle boxes etc (more ideas on the Klem website). These clamps are about £14 each to buy. We now have a stock of fifty clamps suitable for 15-18mm boards (enough to make up ten or twelve decent three-board displays etc) and a current stock of around twenty boards.

Now available for low-cost hire

Boards and clamps are now available for local individuals and groups as a low-cost hireable resource from Printworks. And we can also advise on planning your displays, transport and set up. Download our information sheet, call us or email for advice, further details, charity rates and date/availability.

Hire rates (price includes clamps!)

Three-day/long weekend (Friday morning to Monday morning) hire:
£7 per board

Full week hire:
£10 per board

Transport in Wivenhoe area (up to 15 boards)
appx £10-£15 (dependant on mileage)


Klemetric (Austrian based) have a quite interesting (if a bit ‘old-school’) site with info about these very versatile clamps and some examples of quite impressive displays using them.

If you want to buy clamps for your own use you can check out their current UK distributor …or just keep an eye on Ebay and pick see if you can up a bargain.

See a few more images:

John Wallett
mobile: 07757305327
Download information sheet,

Members pages

Wivenhoe Printworks has been started by a small core group of people who want to set up a printmaking facility here and who are committed to developing this as a community resource which will draw in a wide range of people with an interest in print.

Members contribute a subscription to help get the project started an keep it running: rent of the space, heating, running costs, insurance, legal fees etc. To kickstart the project we agreed to put in £400 a year each (or an equivalent monthly). As we get more core members and start to bring in additional income from ad hoc booking, short courses or through occasional sale of works we will be able to start channeling more of these funds into improving the facilities and running more courses.

During the current Coronavirus situation all our courses and public activities are suspended until further notice. Please use the Contact page and add your details to our mailing list so we can keep you informed of any new developments.

If you would like to find out more please contact Natalie Eldred (Promotion), Eliza Kentridge (Co-ordinator), Jean McNeil (Treasurer) or John Wallett (Chair) by emailing

Braintree Albion

The college is closing down its art facility there and our main purpose was to look at the Albion relief press that was still in the print room. We measured it up so here are the main dimensions plus some photos of the press, together with other rather forlorn art room furniture that (who knows) may also be available if we wanted to make an offer:

Platen 61 x 45 cm
Type bed 70 x 54 cm
Tympanum 74 x 57 cm
Feet width apart 70 cm
Knees (‘Hips’?) width apart 80 cm
Width of machine (handle to handle) 120 cm

Overall length (extent of feet to out folded Tympanum) 210 cm
Overall height (appx) 210cm

John W