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1 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper Rita Udina Paper & book restorer. Barcelona (SPAIN)

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Presentation on theme: "1 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper Rita Udina Paper & book restorer. Barcelona (SPAIN)"— Presentation transcript:

1 1 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper Rita Udina Paper & book restorer. Barcelona (SPAIN) Symposium Technical drawings and their Reproductions The Hague 6-7 October 2014

2 2 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Investigator, architect What is impregnated paper?

3 3 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com What is impregnated paper? 1918 1900 1863 Archivist, curator

4 4 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Bends  Cuts  …. Scotch tape 1924

5 5 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Can you restore my impregnated paper? Restorer

6 6 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Wrinkles and folds disturbing image. May be more visible than the drawing

7 7 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Sharp cuts (on folds or anywhere)

8 8 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Limitation of aqueous treatments Presence of varnishes / oils

9 9 Paper & books conservator - restorer Oxidation  Brittleness  Bends, folds = cracks, tears Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com

10 10 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Varnish, oil Oxidation  low pH Transparency Brittleness Yellowing Goals to achieve: RedOx stability  higher pH Transparency Flexibility More flexible  Less consolidation (layers) needed Maintenance of scale Acqueous treatments?

11 11 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Less important: Yellowing Consequence with no damage in itself. Strict maintenance of scale (plans/maps).

12 12 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Treatment example Impregnated laid paper Ink, watercolour 1918 Several fragments (40 x 60 cm aprox.) 90 µ thick

13 13 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com

14 14 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com After varnish removal (ethanol) Loss of transparency

15 15 Paper & books conservator - restorer Adding missing areas, flattening Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Washi paper Water cleaning (deac.). Lining Apply varnish pH 5,0  7,0

16 16 Paper & books conservator - restorer Adding missing areas, flattening Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Washi paper + paste Watercolour shows again Paraloid B72, 50gr/L Water cleaning (deac.). Lining Apply varnish

17 17 Paper & books conservator - restorer Adding missing areas, flattening Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Tainted washi paper + Klucel Water cleaning (deac.). Lining Apply varnish

18 18 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com cracks tears

19 19 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement Results

20 20 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Slightly more opaque Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement TRANSPARENCY Good, though limited when lining. Slightly more opaque

21 21 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement

22 22 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement

23 23 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement Diminishing yellowing depends on varnish concentration and oxidation degree

24 24 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement

25 25 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement

26 26 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Characteristics BeforeAfter Innocuous Transparency Good, though not excellent when lining. Intense colour tone OK Scale Guaranteed even with aqueous treatments. Yellowing A lotStill a lotInsignificant improvement Detrimental Ongoing oxidation Due to shellac --- Significantly reduced Acidity pH=5,0pH=7,0 Significantly reduced when aqueous treatment is possible Brittleness Unsafe handling Safe handling Excellent improvement

27 27 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Other aspects Applicability  Presence of stamps, scotch tape, technique (ink, watercolour, graphite), papers (diferent thicks…). Reversibility Toxicity Ethanol bath Ethanol + Toluene bath

28 28 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com

29 29 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper www.ritaudina.com Contact details: Rita Udina info@ritaudina.com Further information soon at my blog: http://ritaudina.com (subscribe by email) Thank you!

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