Cold press paper

A cold-pressed paper is useful when a painting requires texture. Hot-pressed watercolor paper provides a smooth painting surface. 

How is hot press watercolor paper different from cold press watercolor paper ... 

Hot pressing results in a smoother surface paper than does cold pressing. 

Artists use many different types of paper to create their artwork. Artists using watercolor, for example, paint on paper that is specially designed for this medium. Watercolor paper may be rough in texture, medium textured, or smooth. Rough- and medium-surfaced papers are called cold press (CP) paper because the textured surface is effected by rolling the newly formed sheet through a set of cold rollers. Smooth-surfaced paper is called hot press (HP) paper because the newly formed sheet is rolled through a set of hot rollers to effect a smooth surface. 

Variety of watercolor papers, each piece cut to the same size (suggested papers cold press, one medium texture, one rough texture hot press, manila white drawing rice and other available papers) watercolor paint paintbrushes mixing containers water containers water masking tape. 

The samples of lemon and lime essential oils were commercial products for flavor materials. Yuzu finits were collected from 10 local wholesale markets from northern to southern Japan in November 1999, and their cold-pressed oils (CPO) were prepared as described in a previous paper. (10) Lemon CPO was prepared from commercially sold fruits by the same method. Authentic chemicals for mass spectrometry were obtained from the commercial sources mentioned in a previous paper. (11)... 

This resin is not only useful as a textile resin but also is of value in the manufacture of adhesives (with starch), wood glues for hot- and cold-pressed plywood, and in the paper wet strength resin area. 

The acetamide often contains a minute amount of impurity having an odour resembling mice excrement this can be removed by washing with a small volume of a 10 per cent, solution of ethyl alcohol in ether or by recrystallLsation. Dissolve 5 g. of impure acetamide in a mixture of 5 ml. of benzene and 1 5 ml. of dry ethyl acetate warm on a water bath until all is dissolved and cool rapidly in ice or cold water. Filter oflF the crystals, press between Alter paper and dry in a desiccator. The unpleasant odour is absent and the pure acetamide melts at 81°. Beautiful large crystals may be obtained by dissolving the acetamide (5 g.) in warm methyl alcohol (4 ml.), adding ether (40 ml.) and allowing to stand. 

Acrylamide [79-06-1 ] M 71.1, m 84°, b 125°/25mm. Crystd from acetone, chloroform, ethyl acetate, methanol or benzene/chloroform mixture, then vac dried and kept in the dark under vac. Recryst from CHCI3 (200g dissolved in IL heated to boiling and filtered without suction in a warmed funnel through Whatman 541 filter paper. Allowed to cool to room temp and kept at -15° overnight). Crystals were collected with suction in a cooled funnel and washed with 3(X)mL of cold MeOH. Crystals were air-dried in a warm oven. [Dawson et al. Data for Biochemical Research, Oxford Press 1986 p. 449.]... 

Benzene-1,2-dithiol [17534-15-5] M 142.2, m 24-25 , 27-28 , b 110-112 , pKEst(i) -6.0, p K s,(2) 9.4. Likely impurities are the oxidation products, the disulfides which could be polymeric. Dissolve in aq NaOH until the soln is alkaline. Extract with Et20 and discard the extract. Acidify with cold HCl (diluted 1 1 by vol with H2O) to Congo Red paper under N2 and extract three times with Et20. Dry the Et20 with Na2S04, filter, evaporate and distil residue under reduced press in an atmosphere of N2. The distillate solidifies on cooling. [UV J Chem Soc 3076 7 955 J Am Chem Soc 81 4939 7957 Org Synth Coll Vol V 419 1973.]... 

Ammonium ferrous sulfate (6H2O) [7783-85-9 (6H20) 10045-89-3 (anhydr)] M 392.1, m 100 (dec), d 1.86. A soln in warm water (l.5mL/g) was cooled rapidly to 0 , and the resulting fine crystals were filtered at the pump, washed with cold distilled water and pressed between sheets of filter paper to dry. 

A solution of 52.8 g. (0.20 mole) of o-xylylene dibromide (Note 6) in 300 ml. of purified dimethylformamide is added dropwise with stirring at such a rate as to maintain a temperature of 60-70° (Note 7). Subsequently the reaction mixture is stirred at room temperature for 3 hours and then poured into 600 ml. of ice water in a 2-1. Erlenmeyer flask. After standing at room temperature overnight the product is collected by suction filtration, pressed on the funnel, and washed twice with 100-ml. portions of water. The crude product is air-dried on filter paper for 2-3 hours and is then dissolved in 1.21. of boiling 95% ethanol. The solution is filtered through a heated funnel, and the filtrate is refrigerated overnight. The crystals are collected on a Buchner funnel and washed on the funnel with 100 ml. of cold 95% ethanol. The product is dried over phosphorus pentoxide in a vacuum desiccator. The yield of white crystals of 2-(% tolylsulf onyl)-dihydroisoindole is 41-46 g. (75-84%), m.p. 174-175° (dec.). 

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