Naslov
Use of lipase to remove oil-based overpaint

Autori
Vokić, Denis ; Berovič, Marin

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
ICOM-CC 14th Trienal Meeting Preprints, Volume 2 / Isabelle Verger - London : Delhi : James & James / Earthscan, 2005, 862-868

ISBN
1-84407-253-3

Skup
ICOM-CC 14th Trienal Meeting The Hague 12-16 September 2005

Mjesto i datum
Den Haag, Nizozemska, 12.09.2005. - 16.09.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
lipase; enzyme; overpaint; polychromy; removal; cleaning

Sažetak
In this case study, excellent results were obtained for the removal of oil-based overpaints using lipase L 0763 Type XII® (Sigma) applied as an aqueous gel. The penetration of gel components was reduced by using a relatively thick gel (5 per cent Klucel G® (Hercules)) and by avoiding the use of tensides in the gel mixture. Surface wetting was achieved by a pretreatment of the overpaint. Gel buffering to pH 7.7 was balanced without use of acids. A warm buffered gel softens the oil overpaint, however, in this case insufficiently to enable quality cleaning and much less efficiently than the same gel after the addition of enzymes. The maintenance of the optimal activity temperature of the applied enzyme gel proved to be neither convenient nor desirable (at 39 °C the gel becomes dried, humidity penetrates, temperature oscillates, and so on). Far better results were obtained with an optimal activity pH and without heating.

Izvorni jezik
Engleski

Znanstvena područja
Znanost o umjetnosti

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