{"id":17464,"date":"2026-01-23T15:50:04","date_gmt":"2026-01-23T13:50:04","guid":{"rendered":"https:\/\/www.ish-tsadik.org.il\/?post_type=faq&#038;p=17464"},"modified":"2026-01-23T15:50:04","modified_gmt":"2026-01-23T13:50:04","slug":"use-of-color-changing-thermometers","status":"publish","type":"faq","link":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/","title":{"rendered":"Use of Color-changing Thermometers"},"content":{"rendered":"<p data-path-to-node=\"0\">This question was posed to <b data-path-to-node=\"0\" data-index-in-node=\"27\">HaGaon Rabbi Shlomo Zalman Auerbach<\/b> (as cited in <i data-path-to-node=\"0\" data-index-in-node=\"76\">Shemirat Shabbat Kehilchata<\/i>, Chapter 18, Section 18).<\/p>\n<p data-path-to-node=\"1\">He clarified the distinction as follows: In the case of <b data-path-to-node=\"1\" data-index-in-node=\"56\">glasses<\/b>, the color change occurs automatically and incidentally by the sun (the action is done &#8220;on its own&#8221;). However, in the case of a <b data-path-to-node=\"1\" data-index-in-node=\"192\">thermometer<\/b>, a person actively places it on the forehead with the intent to trigger the change. Therefore, it is prohibited.<\/p>\n","protected":false},"author":5,"featured_media":0,"template":"","class_list":["post-17464","faq","type-faq","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Use of Color-changing Thermometers - Ish Tsadik<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Use of Color-changing Thermometers - Ish Tsadik\" \/>\n<meta property=\"og:description\" content=\"This question was posed to HaGaon Rabbi Shlomo Zalman Auerbach (as cited in Shemirat Shabbat Kehilchata, Chapter 18, Section 18). He clarified the distinction as follows: In the case of glasses, the color change occurs automatically and incidentally by the sun (the action is done &#8220;on its own&#8221;). However, in the case of a thermometer, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/\" \/>\n<meta property=\"og:site_name\" content=\"Ish Tsadik\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/\",\"url\":\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/\",\"name\":\"Use of Color-changing Thermometers - Ish Tsadik\",\"isPartOf\":{\"@id\":\"https:\/\/www.ish-tsadik.org.il\/#website\"},\"datePublished\":\"2026-01-23T13:50:04+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u05d3\u05e3 \u05d4\u05d1\u05d9\u05ea\",\"item\":\"https:\/\/www.ish-tsadik.org.il\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Use of Color-changing Thermometers\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.ish-tsadik.org.il\/#website\",\"url\":\"https:\/\/www.ish-tsadik.org.il\/\",\"name\":\"Ish Tsadik\",\"description\":\"Just another WordPress site\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.ish-tsadik.org.il\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Use of Color-changing Thermometers - Ish Tsadik","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/","og_locale":"en_US","og_type":"article","og_title":"Use of Color-changing Thermometers - Ish Tsadik","og_description":"This question was posed to HaGaon Rabbi Shlomo Zalman Auerbach (as cited in Shemirat Shabbat Kehilchata, Chapter 18, Section 18). He clarified the distinction as follows: In the case of glasses, the color change occurs automatically and incidentally by the sun (the action is done &#8220;on its own&#8221;). However, in the case of a thermometer, [&hellip;]","og_url":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/","og_site_name":"Ish Tsadik","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/","url":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/","name":"Use of Color-changing Thermometers - Ish Tsadik","isPartOf":{"@id":"https:\/\/www.ish-tsadik.org.il\/#website"},"datePublished":"2026-01-23T13:50:04+00:00","breadcrumb":{"@id":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.ish-tsadik.org.il\/en\/faq\/use-of-color-changing-thermometers\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u05d3\u05e3 \u05d4\u05d1\u05d9\u05ea","item":"https:\/\/www.ish-tsadik.org.il\/en\/"},{"@type":"ListItem","position":2,"name":"Use of Color-changing Thermometers"}]},{"@type":"WebSite","@id":"https:\/\/www.ish-tsadik.org.il\/#website","url":"https:\/\/www.ish-tsadik.org.il\/","name":"Ish Tsadik","description":"Just another WordPress site","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ish-tsadik.org.il\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.ish-tsadik.org.il\/en\/wp-json\/wp\/v2\/faq\/17464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ish-tsadik.org.il\/en\/wp-json\/wp\/v2\/faq"}],"about":[{"href":"https:\/\/www.ish-tsadik.org.il\/en\/wp-json\/wp\/v2\/types\/faq"}],"author":[{"embeddable":true,"href":"https:\/\/www.ish-tsadik.org.il\/en\/wp-json\/wp\/v2\/users\/5"}],"wp:attachment":[{"href":"https:\/\/www.ish-tsadik.org.il\/en\/wp-json\/wp\/v2\/media?parent=17464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}