ブックタイトルConservation and Restoration of Western Paper

概要

Conservation and Restoration of Western Paper

The solution is poured into a heat resistanttray while it is still hot and runny, and therigid hydrogel film forms as the solutioncools to room temperature (Photos 22ad).Gellan gum is susceptible to mould, andcan be can be covered and refrigerated forapproximately 2 weeks.Gellan gum can also be prepared withouta saline solution, which reduces the degreeof rigidity. The absence of calcium ionsin lower gel concentrations however mayrender the cast film too mushy and crumblyto handle. The calcium ions stabilize thegel structure, rendering it more firm andeasily manipulated. Similarly, the degree ofwater purity will also affect the ability of thegellan gum to form an adequately rigid form.Depending on the intended use of the gel, alower concentration of less rigidity may bedesired.5-2. STAIN REDUCTION WITH GELLANGUMA paper dress made from a highly textured,Diagram 8 Calculation of gel concentrationPhoto 22a A saline solution is prepared with 0.4g/l calciumacetate in reverse-osmosis waterPhoto 22b Gellan gum powder is measured according todesired gel concentration and quickly whisked intothe saline solutionPhoto 22c Gellan gum solution is heated in a microwaveuntil hydrated (allow to boil for a few minutes)Photos 22a-d Preparation of gellan gum gelPhoto 22d Gellan gum solution is immediately pouredinto heat proof pan to desired thickness73