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  • Merrythought Village, Ironbridge, TF8 7NJ
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  • Fine Art Printmaking Gallery Since 1980
Ironbridge Fine Arts
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01952 434033

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Etching Recipes

Home / Printmaking / Intaglio Printmaking Techniques / Etching Recipes

All the Etching Recipes below are a guide only, and you use at your own risk. Please take all health and safety and precautions and wear protective clothing.

Etchant – Nitric Acid comes as 70% strength. This is extremely harmful and must be used with caution. 

Health & Safety- The gases that come from this acid are very harmful so wear a mask and full protective health and safety gear. Always mix the acid into the water and not the other way around. Always decant the acid at the end of the day and always use an extractor unit to work with this acid.

 Test plates are advisable for both line and tone for any of the acids or plate making mordants.

MetalNitric AcidHow to mix
Copper Strong2 Water to 1 Nitric Acid2 Parts Water first then 1 part Nitric Acid second
Copper Weak Mix3 Water to 1 Nitric Acid3 Parts Water first then 1 part Nitric Acid second
   
Steel Strong Mix5 Water to 1 Nitric Acid5 Parts Water first then 1 part Nitric Acid second
Steel Weak Mix8 Water to 1 Nitric  Acid8 Parts Water first then 1 part Nitric Acid second
   
Zinc strong10 Water to 1 Nitric Acid10 Parts Water first then 1 part Nitric Acid second
Zinc Weak18 Water to 1 Nitric Acid18 Parts Water first then 1 part Nitric Acid second

 

Use Extractor unit and all safety precautions. Use at own risk. Mask, gloves and extractor unit etc…

Neat Acid for Spit Biting – always mix with a little water to get it etching and then paint onto your plate.If you would like to get rid of this solution do NOT tip down the sink. Take to your local tip and they will advise you on how to get rid of the liquid.

 

Mordant – Saline Solution, Copper Sulphate and Salt mix

This is a great Non-Toxic Mordant to use. Wear a mask when mixing the Copper Sulphate with the Salt. Always wear gloves even thought its Non-Toxic

Just remember that this mordant likes to bite line well but when it comes to etching tone it can undercut the aquatint very easily so if the plate is left in to long, or the grade of metal is weak, it might etch your tones to much. Always use caution. Test plates are always advisable for both line and tone for any of the acids or plate making mordants. Wear a mask when mixing but this is the most Non-Toxic mordant

MetalSaline Solution – Copper Sulphate and SaltHow to Mix 
Steel, Zinc, Aluminium and stainless steel (Same mix for all)

10 litres of Tap Water, 500g Copper Sulphate 125g of Sodium Chloride (table salt)  (or a stronger mix but will give you less control over tone) 

Or a very strong mix

200g Salt & 200g of Copper Sulphate with 1 litre of hot water 
to dissolve and mix up and then another 1 litre of cold water.

Put the Water into the mordant tray, add the salt and dissolve. Once dissolved add to the copper sulphate. Once it has all 
mixed together it is ready to use.OrAdd the Salt and Copper Sulphate together with 1 litre of hot water, let it dissolve and mix together then add another 1 litre of water and its ready to use.
 
Use a mask and gloves when mixing but once its mixed it is classed as Non-Toxic so still wear gloves but a extractor unit is not necessary. Use at own risk.   To rejuvenate this mordant you can add 100g of Salt and 100g of copper sulphate together mixed with half a litre of water. Add this to the bath of Saline solution and this will keep it going for longer.If you would like to get rid of this solution, leave in open air in a tray, it will over a few weeks turn into powder that you can throw in the bin. Or take to your local tip and they will advise you on how to get rid of the liquid. 

 

Etchant – Ferric Chloride

This is the old way of etching plates before Edinburgh Etch was invented where citric acid is added to the mix to help you etch plates the right way up so you can see the etch in process. Full health and safety gear needed including an acid extractor unit and masks and gloves.

MetalFerric Chloride 42°- 48° Baume’ DensityHow to Mix
Aluminium1 litre Ferric Chloride 45° Baume’ to 4 litres of waterMix one to the other and wear protective gloves and mask
Copper Bras and ZincThree strengths 1. 33° Be’ (fast) 2. 35° Be’ (fairly fast)  3. 45° Be’ (slow)Use Extractor unit and all all safety precautions. Use at own risk
   
Use Extractor unit and all safety precautions. Use at own risk. Mask, gloves and extractor unit etc…Note there is no citric acid so you need to bite the plates face down and agitate the bath frequently.If you would like to get rid of this solution do NOT tip down the sink. Take to your local tip and they will advise you on how to get rid of the liquid.

 

Etchant – Copper Sulphate Powder.

This is a good way of working with Steel, Zinc and Aluminium. Nitric acid is also a good way to work with these metals. Copper Sulphate powder is probably a little bit more user friendly though. Always use caution. Test plates are always advisable for both line and tone for any of the acids or plate making mordants.

MetalCopper Sulphate PowderHow to Mix
Steel Zinc and Aluminium strong100g Copper Sulphate powder to 1 litre of WaterMix one to the other and wear protective gloves and mask
Steel Zinc and Aluminium weak50g Copper Sulphate powder to 1 litre of WaterMix one to the other and wear protective gloves and mask
Use Extractor unit and all safety precautions. Use at own risk. Mask, gloves and extractor unit etc… If you would like to get rid of this solution do NOT tip down the sink. Take to your local tip and they will advise you on how to get rid of the liquid.

 

Etchant – Edinburgh Etch (Ferric Chloride and Citric acid)

This is a very popular way of working with both copper and steel. Always mix a separate bath for each metal. Always use caution. Test plates are always advisable for both line and tone for any of the acids or plate making mordants.

MetalEdinburgh EtchHow to Mix
Copper and Steel250 grams citric acid dissolved in 750 ml of warm water + to 4 litres of ferric chloridedissolve the citric acid in the warm water and then once 
dissolved add to the 4 litres of ferric chloride
   

Use Extractor unit and all safety precautions. Use at own risk. Mask, gloves and extractor unit etc…

  If you would like to get rid of this solution do NOT tip down the sink. Take to your local tip and they will advise you on how to get rid of the liquid.

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