Paraloid B72
For thin B-72 (~48% w/v) For thick B-72 (~55.5% w/v).
Ideal for glass or earthenware pottery.
1. Place a tall or wide-mouthed jar on a
digital balance and zero or tare the scale.
1. Place a tall or wide-mouthed jar on a digital balance and
zero or tare the scale.
2. Pour 81 g (105 mL) of acetone into the jar. 2. Pour 70 g (90 mL) of acetone into the jar.
3. Stir in a level teaspoon of hydrophobic
fumed silica (Aerosil 200 or Cabosil).
3. Stir in a level teaspoon of hydrophobic fumed silica
(Aerosil 200 or Cabosil).
4. Weigh out 50 g of B-72 and tie it up into
a tight cheesecloth “ball.” Suspend the ball
over the acetone so that it just touches the
top of the solvent.
4. Weigh out 50g of B-72 and tie it up into a tight
cheesecloth “ball.” Suspend the ball over the acetone so
that it just touches the top of the solvent.
DO NOT STIR OR AGITATE! Th e B-72 will dissolve faster by just taking advantage of gravity. As the
resin dissolves and sinks toward the bottom of the jar, pure acetone at the top is made available to
continue the dissolution of the resin in the cheesecloth ball.
Leave the jar alone until the resin is totally dissolved (usually six to eight hours), preferably
overnight. Once it is completely dissolved, remove the cheesecloth bag, stir with a glass stirring rod
to homogenize the mixture, and pour into aluminum adhesive tubes. No further evaporation is
necessary.
Beva 371
1) In a 1-quart container, sprinkle 5 tablespoons methylcellulose powder into 1 cup of very hot water. Stir briskly to prevent lumps.
2) When the powder is thouroughly dispersed, add enough cold water to make 1 quart. Let sit for several hours, prefereably overnight.
To thin, add a few drops of water, mix and let stand.
When ready to use, decant a small amount into a heavy, wide-mouth jar. Never dip the brush into the main supply.
Think methyl cellulose can be used for mending paper with Japanese tissue and to clean the spines of books. The mixed adhesive will not spoil if kept clean.
Methyl Cellulose
(From Talas)
1) In a heated water bath (double boiler) add contents of package A, add 1000g Toluene and 250g Benzine (naptha). Stir until dissolve.
2) In a separate heated water bath (double boiler), add contents of package B and add 550g Bezine and stir until dissolved. Then pour contents of B into A and stir well together. Slowly let cool in the double boiler until water is cool.
For parts to be completely dissolved, each solution must be above the cloud point (clear with no lumps) separately and together.
Methyl cellulose with Elvace or Jade 403 for Bookbinding:
18g methyl cellulose, 20g calsium carbonate, 1L water.
Mix and let stand for several hours. Yield should be about 4 cups.
Mix one pint of this mixture with one pint of Elvace or Jade.
Methyl cellulose for Marbling:
Combine 6 tablespoons of methyl cellulose with 1 cup of very hot water.
Blend thoroughly with a whisk or stick blender and repeat every hour for a few hours. Let stand overnight for solution to clear and thicken.
Wheat Starch Paste
1) Combine 1 part wheat startch paste with 4 parts of deionized water. Let sit, covered, at least one hour. Making wheat starch paste at the Brooklyn Museum, rev. 3/18/14 (Adapted from Wheat Starch Paste – CCI Notes 11/4) Talas
2)Cook and stir over medium-high heat in enamel or glass pot until thick and transparent (15-25minutes). Remove from heat and allow to cool.
Store in covered jar and place in a cool, dry, dark place for up to one week (longer if sealed into syringes).
Before use, push through a strainer twice and dilute with water using a stiff bristle brush until a creamy consistency is obtained.Brooklyn Museum/CCI notes
1)Preparing the wheat starch paste
Weigh out 4 grams of starch powder on the scale and transfer it into a glass beaker.
Using a graduated beaker, measure 32 mL of deionized water. Pour the water into the beaker and stir with a glass rod until all the lumps have dissolved and the mixture is combined. Cover the mixture and let stand for about 10 minutes.
2) Cooking the wheat starch
Wait at least 10 minutes after the microwave has been used to prevent overheating. Remove the glass stirring rod and place the beaker in the center of the microwave. Set the microwave at power 3, and the seconds for each cook interval as follows: 15, 9, 7, 5. Repeat the 5 second interval as needed. At each interval, stir the starch/water mixture with the glass rod until it’s well combined and uniform. As it thickens, stir continuously until slightly translucent and smooth. Allow the warm beaker to cool in a bigger beaker with ~10mL of water (double bath). Repeat as needed
3) Thinning the paste
When the paste reaches room temperature, it will have thickened appreciably. If the paste is too thick for a particular procedure, thin it by adding distilled water and stirring vigorously. Thinning at this point usually creates lumps, which can be removed by forcing the paste through a sieve. Subsequent dilutions can be achieved simply by adding water and stirring; lumps should not recur. Storage Store paste in a container made of glass, ceramic, or plastic that has a non-metallic lid and that has been sterilized with boiling water. At room temperature, the paste will last for at least three days; if refrigerated, it will last for at least seven days. Stored paste must be put through a sieve and thinned before it is used. Paste should be discarded as soon as it separates or sours.
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