Workshop on aqueous cleaning

Workshop

"Dos and Don'ts: Aqueous methods and materials.  Raising awareness
    on the possibilities and safe boundaries of surface cleaning"

Universidad Politecnica de Valencia
1-2 July 2014 (16 hours)

Instructors Richard Wolbers and Paolo Cremonesi

Program

Day 1
1 July 2014

    9-11.00         Soils: Definition, sources, composition and
                    interaction with the work of art

                        Why do we clean painted surfaces?  Aesthetic
                        vs. preservation aspects to cleaning

                        A short introduction to the history of
                        aqueous methods (e.g. saliva, caustic
                        materials, etc)

                        Nature of soils; soil transport to painted
                        surfaces; soil retention mechanisms

                        The contribution of paints and paint
                        deterioration to soil retention

                        Influence of temperature, RH; cementation of
                        soils

                        Strategies for dirt 'pick up' and its
                        implications to approach cleaning
                        treatments.

                        Why aqueous cleaning?

    11.00-11.30         Coffee break

    11.30-13.30         Surface cleaning strategies: Aqueous tools
                        for cleaning

                            pH, pH regulation with buffers

                            Ionic concentration and conductivity;
                            measuring pH, conductivity on painted
                            surfaces and aqueous solutions

                            Hypo-, hyper-, and isotonic conditions

                            Chelating materials

                            Surfactants: CMC; HLB; TCP

                            Clearance and clearance strategies

                            Recipes for 4-6 "core" or "stock"
                            aqueous solutions that we use all the
                            time in our studio, and how they might
                            be delivered in various forms to both
                            test and generally clean painted
                            surfaces to provide the audience with a
                            practical set of materials they could
                            begin making themselves

                            Gel-forming materials: agarose and
                            xanthan gums

                            'Holding out' aqueous materials with
                            silicone 'masking' solvents

    13.30-15.00             Lunch

    15.00-16.30 Workshop 1  Demonstration/Practicum:  pH,
                            conductivity, building workshop
                            solutions

    16.30-17.00             Coffee break

    17.00-19.00             Workshop 2

                            Demonstration/Practicum:  Building
                            workshop solutions; viscosity control;
                            silicone 'hold out' solvents

Day 2
2 July 2014

    9-11.00                 Aqueous Methods: Beyond Surface Cleaning

                                "Beyond Surface Cleaning" When do we
                                modify/use aqueous media for
                                performing tougher operations, i.e.
                                the removal of varnishes,
                                retouchings?

                                Macro-Emulsions: o/w, w/o, inverse
                                emulsions

                                Polymeric Emulsifiers

                                How to modify the aqueous phase and
                                the solvent phase.

                                'Green' solvent choice

    11.00-11.30                 Coffee Break

    11.30-13.30                 Latest Developments 3 Microemulsions

                                Clearance issues with surfactant
                                containing systems

                                Preservation (anti-biologic)
                                materials for aqueous systems

    13.30-15.00                 Lunch

    15.00-16.30            Workshop 3

                                Demonstration/Practicum:  Gel
                                Forming Emulsions

    16.30-17.00            Coffee break

    17.00-19.00            Workshop 4

                                Demonstration/Practicum:
                                Micro-Emulsions

For further information: conservacion&restauracion<-a t->upv< . >es

Dr. Laura Fuster Lopez
Dept. Conservacion y Restauracion de Bienes Culturales
Universidad Politecnica de Valencia
Camino de Vera s/n
46022 Valencia (Spain)
+34 963 877 310 ext 73106


                                  ***
                  Conservation DistList Instance 27:46
                   Distributed: Tuesday, May 27, 2014
                       Message Id: cdl-27-46-017
                                  ***