162 Endnotes areas, it became clear that traces of it remained visible at the edges of the square areas. It was decided to continue the treatment following the forms and shapes of the painting. Consequently, the resulting marks were less visible. 82 Where it was not possible to remove the iron nails completely, the remaining remnants were filed down with a metal file and were covered with two applications of Paraloid B72 30% dissolved in acetone and xylene 1/1 to prevent further corrosion and subsequent deterioration of the adjacent canvas. In addition, small cut-to-size patches of SEFAR Polyester tissue, laminated with BEVA-Film 371 were ironed onto all treated iron nails with a hot spatula as a second protection from corrosion. 83 The decision for the binding materials was made because of the high humidity in the church. Animal glue should not be used due to the reactions to the changing of the humidity in the surrounding. 84 After the varnish application the final retouches were done with Gamblin colours and a solvent mixture of two parts of Dowanol (1-Methoxy-2 propanol) and one part of Shellsol T. This relatively high Dowanol content allowed for a smooth mixing of the paint and precise application of fine glazes. In order to achieve easy reactivation of the colours, pure Dowanol was sometimes used. To achieve the appropriate gloss, an additional quantity of Laropal A81 was occasionally needed. This was prepared as a 20% solution in Dowanol for further reactivation of the Gamblin colors. 85 “According to a theological doctrine especially developed in the West catholic church, purgatory (Latin “Ignis purgatorius” or “Purgatorium” purification site) is the place for purification. It is experienced by those who have died in the grace of God but have not yet been completely purified (not yet freed from all sins) to enter into heaven. Purgatory is therefore a place of “temporary punishment” and thus a vision of hope for the faithful.” Purgatory, in: Wikipedia (26.5.2024) 86 The thread diameters vary between approximately 0.7-1.0 mm in both directions (s-drill). The canvas is woven relatively evenly and narrowly. The thread number/cm is horizontal approximately 11-12 and vertical 13-14. 87 EDX by CICS TH Köln 88 EDX by CICS TH Köln 89 Due to the severe damage caused by earlier cleaning measures, the examinations did not provide any clear indications if the painting was originally varnished although this can be assumed. 90 A pH measurement was made by an Abbey pH pen on several places to determine whether the canvas was acidic or not. Test showed that pH was below pH 7. 91 As the treatment was planned for a series of workshop periods, there was the chance to evaluate and control the separate procedures in annual distance. Thus, a process of regular quality control was possible. 92 This is a common method for the preservation of paper, but an uncommon treatment for canvas as there is the risk of shrinkage due to the amount of water applied to the canvas.
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