Different shades of red: The complexity of mineralogical and physico-chemical factors influencing the colour of ceramics

Bonis, Alberto De; Cultrone, Giuseppe; Grifa, Celestino; Langella, Alessio; Leone, Alessandro; Mercurio, Mariano; Morra, Vincenzo

doi:10.1016/j.ceramint.2017.03.127

Cited by 78 publications

(42 citation statements)

References 33 publications

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“…The well sorted and very fine‐grained sand of quartz and microfossils of the samples from Cádiz suggest a good selection of sieved raw material. The calcareous matrix is homogeneous and ochre, suggesting controlled oxidizing atmosphere of firing and low amount of hematite . However, significant petrographic differences were not highlighted between samples of the 6 th century BC and 8 th century BC from Cádiz, which seem to be made with a very similar raw clayey materials and similar technology of production.…”

Section: Resultsmentioning

confidence: 95%

“…The inclusions are carbonate rock fragments and microfossils mainly, resulting for these reasons, very different respect to samples of the other archaeological context, as clearly suggested by voltammetric data in Figures b and 9b. The homogeneous ochre color of the calcareous matrix allows to hypnotize that the control of firing conditions is fine and under oxidizing condition . The ochre color of the matrix may be due to a higher content of Ca in the raw material, because this condition supports the formation of newly Ca‐silicates phases and prevent an abundant hematite crystallization, leading to a ochre‐beige color of the matrix .…”

Section: Resultsmentioning

confidence: 99%

“…The homogeneous ochre color of the calcareous matrix allows to hypnotize that the control of firing conditions is fine and under oxidizing condition . The ochre color of the matrix may be due to a higher content of Ca in the raw material, because this condition supports the formation of newly Ca‐silicates phases and prevent an abundant hematite crystallization, leading to a ochre‐beige color of the matrix . Consistently with these petrographic features, the voltammetric response of Mogador differs from the other red samples.…”

Section: Resultsmentioning

confidence: 99%

“…Concerning Motya samples, the moderately sorted and fine grained inclusions suggest a careful selection of the raw material that probably have been sieved while the temperature and the condition of firing seem to be similar for all the samples. In fact, the homogeneous red color of the matrix testifies a controlled oxidizing atmosphere of firing, that permit the formation of hematite [13,54,55].…”

Section: Discussionmentioning

confidence: 99%

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Discrimination and Provenances of Phoenician Red Slip Ware Using both the Solid State Electrochemistry and Petrographic Analyses

et al. 2019

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Solid state electrochemistry based on the voltammetry of immobilized microparticles (VIMP) methodology is applied to a series of 80 Phoenician Red Slip samples from the archaeological sites of Motya (Sicily, Italy), Mogador (Morocco), Ramat‐Rahel (Israel), Sulky (Sardinia, Italy), Tas Silg (Malta), Pantelleria (Italy), and Cádiz (Spain), dated from the 8th to the 6th century BC. Upon attachment of sub‐microsamples to graphite electrodes in contact with aqueous H2SO4 electrolyte, voltammetric features due to the reduction of Fe(III) minerals and the oxidation of Fe(II) ones, complemented with electrocatalytic effects on oxygen reduction and oxygen evolution reactions, provide characteristic electrochemical fingerprints for pottery samples. A consistent sample grouping discriminating between different potteries from different archaelogical sites, is obtained, all results being consistent with morphological, compositional and mineralogical data. Petrographic analysis supports the grouping, defining the manufacture and firing procedure for the different archaeological context.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Discrimination and Provenances of Phoenician Red Slip Ware Using both the Solid State Electrochemistry and Petrographic Analyses

et al. 2019

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“…Analysis of modern production of colored brick using high-performance color modifiers [11][12][13][14][15][16] shows that bulk coloring of wall ceramic materials with oxide pigments generally causes a number of problems. One of the main problems is disruption of sintering process of argillaceous minerals while burning which leads to degradation of physical and mechanical properties of ceramics [17,18].…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of ceramic brick colored by manganese-containing wastes

et al. 2018

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Abstract. The given paper investigates the influence of manganesecontaining wastes on bulk coloring and physical and mechanical properties of wall ceramic materials with matrix structure. Conventional research methods to study physical and mechanical properties of ceramic specimens were used in the present study. The structure and phase state of decorative ceramic materials were investigated by means of physical-chemical analysis. Authors suggested the model to form coloring layer in ceramic matrix composites based on argillaceous raw materials and coloring pigment. Macrostructure was studied on ceramic samples manufactured according to the developed method from clay loam of moderate plasticity and wastes of manganese mining. The paper provides results of pilot testing on production of colored ceramic brick. It was found that incorporation of coloring component does not decrease strength properties of ceramic matrix materials. Authors defined the palette and color code for decorative ceramic specimens manufactured with different content of coloring component of manganese mining wastes according to RGB color codes chart.

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Production technology of late Roman decorated tableware from the Vesuvius environs: Evidence from Pollena Trocchia (Campania region, Italy)

et al. 2020

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The northern slope of Mt. Vesuvius contains some interesting archaeological sites, including the site discovered in the town of Pollena Trocchia, where the remains, dated to between the 79 and 472 CE eruptions, document the transition from the Roman to late Roman cultural and socioeconomic settings. Profound changes occurred in this time interval, which can be inferred from changes in the ceramic manufacturing processes. Common wares, as the most widespread ceramic class in the archaeological record, are a useful example that illustrates this technological transformation. Seventeen samples of tableware, distinguished into three ceramic classes according to the method of slip application (i.e., Slipped Ware, Painted Ware “a straccio,” and Painted Ware), were analyzed. The results highlight the use of high‐CaO clayey raw materials compositionally similar to Apennine clayey deposits. The clay bodies were occasionally tempered with sandy‐silt materials composed of volcanic grains with lesser amounts of siliciclastic fragments. Firing temperatures ranged from 800 to 950°C, as suggested by quantitative X‐ray powder diffraction and microstructural analyses combined with colorimetric measurements of the ceramic bodies. Micro‐Raman analyses performed on slips revealed the use of ochre for decorating the vessels; it was applied in a different way, representing an actual technological change.

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Different shades of red: The complexity of mineralogical and physico-chemical factors influencing the colour of ceramics

Cited by 78 publications

References 33 publications

Discrimination and Provenances of Phoenician Red Slip Ware Using both the Solid State Electrochemistry and Petrographic Analyses

Discrimination and Provenances of Phoenician Red Slip Ware Using both the Solid State Electrochemistry and Petrographic Analyses

Structure and properties of ceramic brick colored by manganese-containing wastes

Production technology of late Roman decorated tableware from the Vesuvius environs: Evidence from Pollena Trocchia (Campania region, Italy)

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