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This paper presents the Gray Concrete Restoration Method (GCR\u2010method), developed to define and apply restoration mortars to smooth white and gray concrete surfaces. The GCR\u2010method comprises: (i) production of restoration mortars (from white to different gray levels) by adding black pigment to reference mortars; (ii) chromatic characterization by image processing; (iii) production and application of restoration mortar; (iv) chromatic evaluation of the restoration; and (v) chromatic reintegration in the transition zone and\/or in the restoration, by applying pointillism and glaze techniques depending on whether are white or gray surfaces. The GCR\u2010method was experimentally calibrated in color spaces HSV and CIELAB, respectively for brightness (V) and color differences (\u0394<jats:italic>E<\/jats:italic><jats:sub>00<\/jats:sub>) evaluation; then, it was applied and validated to the restoration of white and gray concrete panels with smooth surfaces. The results show the desired chromatic compatibility between the original surface and the restoration, not noticeable to the naked eye. Further, the chromatic reintegration procedures demonstrate that color analysis is fundamental for the decision\u2010making of restoration interventions in Concrete Heritage.<\/jats:p>","DOI":"10.1002\/suco.202000054","type":"journal-article","created":{"date-parts":[[2020,9,5]],"date-time":"2020-09-05T12:05:57Z","timestamp":1599307557000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Chromatic design and application of restoration mortars on smooth surfaces of white and GRAY concrete"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5075-2011","authenticated-orcid":false,"given":"Judite","family":"Miranda","sequence":"first","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0191-0308","authenticated-orcid":false,"given":"J\u00f3natas","family":"Valen\u00e7a","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3445-0694","authenticated-orcid":false,"given":"Hugo","family":"Costa","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Lisbon Portugal"},{"name":"Department of Civil Engineering Polytechnic Institute of Coimbra  Coimbra Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1690-9887","authenticated-orcid":false,"given":"Eduardo","family":"J\u00falio","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Lisbon Portugal"}]}],"member":"311","published-online":{"date-parts":[[2020,9,5]]},"reference":[{"key":"e_1_2_8_2_1","unstructured":"P.Legorburu Escudero Criteria on the reintegration of gaps in works of art and significance of stucco in the final result according to its composition and application' PhD thesis University of the Basque Country Faculty of Fine Arts; 1995."},{"key":"e_1_2_8_3_1","volume-title":"Conservation treatment methodology","author":"Appelbaum B","year":"2007"},{"key":"e_1_2_8_4_1","first-page":"99","article-title":"Ceramics applied in architecture: Towards a normalization of intervention criteria","volume":"1","author":"\u00c1lvarez JJL","year":"2010","journal-title":"Ge\u2010conservaci\u00f3n"},{"key":"e_1_2_8_5_1","first-page":"401","volume-title":"De Viollet\u2010Le\u2010Duc to the Venice charter: Restoration theory and practice in the Ibero\u2010American space","author":"Pereira SR","year":"2014"},{"key":"e_1_2_8_6_1","volume-title":"The investigation and repair of historic concrete","author":"Macdonald S","year":"2003"},{"key":"e_1_2_8_7_1","unstructured":"GaudetteP. 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