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 transcript:

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 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper Investigator, architect What is impregnated paper?

3 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper What is impregnated paper? Archivist, curator

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

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

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

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

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

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

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

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

13 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper

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

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

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

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

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

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

28 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper

29 Paper & books conservator - restorer Replacing varnishes on architectural drawings on impregnated paper Contact details: Rita Udina Further information soon at my blog: (subscribe by ) Thank you!