美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）提醒：
Follow the directions in the package. Pay attention to all "Caution" and "Warning" statements.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
美國FDA消費者衛教頁面（Hair Dyes）的安全清單也列出：
Follow all directions on the label and in the package.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
同一頁面並說明，依法規（FD&C Act 601(a)），煤焦油染髮劑標籤必須刊印以下法定警示語：
Caution — This product contains ingredients which may cause skin irritation on certain individuals and a preliminary test according to accompanying directions should first be made. This product must not be used for dyeing the eyelashes or eyebrows; to do so may cause blindness.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
不同品牌、不同配方的染髮產品，說明書細節可能不同。以上操作提醒均適用於「本產品說明書所規定的使用方式」，不是所有染髮產品共用的單一操作流程。
兩份FDA頁面均獨立提及此項。
美國FDA消費者衛教頁面（Hair Dyes）安全清單：
Wear gloves when applying hair dye.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）：
Wear gloves when you apply the hair dye.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
美國FDA消費者衛教頁面（Hair Dyes）安全清單：
Do not leave the product on longer than the directions say you should. Keep track of time using a clock or a timer.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）亦列出：
Don't leave the dye on longer than the directions say you should.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
FDA安全清單建議以時鐘或計時器追蹤時間，依本產品說明書的規定時間操作，不要超過說明書所列的時限。
美國FDA消費者衛教頁面（Hair Dyes）安全清單：
Rinse your scalp well with water after using hair dye.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）：
Rinse your scalp well with water after dyeing.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）：
Never mix different hair dye products. This can hurt your hair and scalp.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）：
Never dye your eyebrows or eyelashes at home. This can hurt your eyes and cause permanent discoloration. You might even go blind.來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
美國FDA消費者衛教頁面（Hair Dyes）同樣說明：
Keep hair dyes away from your eyes, and do not dye your eyebrows or eyelashes. This can hurt your eyes and may even cause blindness.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
FDA頁面（Hair Dyes）補充說明，「煤焦油染髮劑」在法律定義上不屬於眉毛或睫毛染劑；如需染眉染睫，需使用另行核准的色素添加物，目前沒有任何色素添加物被核准用於居家自行染眉或染睫。
美國FDA消費者衛教頁面（Hair Dyes）安全清單：
Do not scratch or brush your scalp three days before using hair dyes. Do not dye or relax your hair if your scalp is irritated, sunburned, or damaged.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
同一頁面另列出：
Wait at least 14 days after bleaching, relaxing, or perming your hair before using dye.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
美國FDA消費者衛教頁面（Hair Dyes）安全清單：
Do a patch test on your skin every time before dyeing your hair.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
同一頁面並說明敏感化的特性：
People can develop sensitivities with repeated exposure. In addition, formulations may change over time. So, it's possible to have a reaction even if you have dyed your hair in the past, without a problem. That's why it's important to follow the instructions and do the skin test before every use. Even if you don't see a reaction to the skin test, it's still possible to have a reaction when you dye your hair.來源：https://www.fda.gov/cosmetics/cosmetic-products/hair-dyes
美國FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）提供了一種具體的操作說明方式（此細節僅見於此頁面，不適用於推論所有產品的通用做法）：
Rub a tiny bit of the dye on the inside of your elbow or behind your ear. Leave it there for two days. If you get a rash, don't use the dye on your hair. You should do the test each time you dye your hair. (Salons should also do the patch test before dyeing your hair.)來源：https://www.fda.gov/cosmetics/resources-consumers-cosmetics/cosmetics-safety-qa-hair-dyes
重要限制：本文呈現的是FDA消費者衛教資訊，不是醫療診斷。皮膚測試沒有出現反應，不代表染髮時一定不會出現反應，也不能排除日後或延遲的反應。不同產品的皮膚測試操作細節應依照本產品說明書進行。
Q1：之前用同款染劑沒有反應，這次還需要做使用前皮膚測試嗎？
需要。美國FDA消費者衛教頁面（Hair Dyes）指出，人體可能因重複接觸而產生敏感，加上染劑配方可能隨時間改變，因此即使過去使用沒有問題，每次染髮前仍應依照本產品說明做使用前皮膚測試。同一頁面也說明，即使皮膚測試沒有見到反應，染髮時仍可能出現反應——這不構成醫療診斷。
Q2：計時超過說明書時間，顏色會不會更深、更持久？
FDA消費者衛教頁面（Hair Dyes）安全清單明確提醒：「Do not leave the product on longer than the directions say you should」，並建議以時鐘或計時器追蹤時間。請依照本產品說明書規定的時間操作，不要自行延長。
Q3：可以用居家染髮產品自己染眉毛或睫毛嗎？
不可以。FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）指出：「Never dye your eyebrows or eyelashes at home. This can hurt your eyes and cause permanent discoloration. You might even go blind.」法定標示警語（FD&C Act 601(a)）也要求標籤必須載明染眉染睫可能導致失明。
Q4：手邊有兩款不同品牌的染髮產品，可以混合使用嗎？
不可以。FDA消費者衛教頁面（Cosmetics Safety Q&A: Hair Dyes）指出：「Never mix different hair dye products. This can hurt your hair and scalp.」請僅依本產品說明書操作。
| 操作提醒 | 出處頁面 | 原文關鍵句 |
|---|---|---|
| 閱讀說明書與警語 | FDA Q&A: Hair Dyes | Follow the directions in the package. Pay attention to all "Caution" and "Warning" statements. |
| 閱讀說明書（安全清單） | FDA Hair Dyes | Follow all directions on the label and in the package. |
| 配戴手套 | FDA Hair Dyes | Wear gloves when applying hair dye. |
| 配戴手套 | FDA Q&A: Hair Dyes | Wear gloves when you apply the hair dye. |
| 依說明書時間計時、不延長 | FDA Hair Dyes | Do not leave the product on longer than the directions say you should. Keep track of time using a clock or a timer. |
| 依說明書時間，不延長 | FDA Q&A: Hair Dyes | Don't leave the dye on longer than the directions say you should. |
| 染後清洗頭皮 | FDA Hair Dyes | Rinse your scalp well with water after using hair dye. |
| 染後清洗頭皮 | FDA Q&A: Hair Dyes | Rinse your scalp well with water after dyeing. |
| 不要混用不同染髮產品 | FDA Q&A: Hair Dyes | Never mix different hair dye products. This can hurt your hair and scalp. |
| 不可染眉染睫 | FDA Q&A: Hair Dyes | Never dye your eyebrows or eyelashes at home. This can hurt your eyes and cause permanent discoloration. You might even go blind. |
| 不可染眉染睫（安全清單） | FDA Hair Dyes | Keep hair dyes away from your eyes, and do not dye your eyebrows or eyelashes. This can hurt your eyes and may even cause blindness. |
| 頭皮刺激／曬傷／受損時不要染 | FDA Hair Dyes | Do not dye or relax your hair if your scalp is irritated, sunburned, or damaged. |
| 染前三天不抓頭皮 | FDA Hair Dyes | Do not scratch or brush your scalp three days before using hair dyes. |
| 漂髮、直髮處理或燙髮後至少等14天再染 | FDA Hair Dyes | Wait at least 14 days after bleaching, relaxing, or perming your hair before using dye. |
| 每次做使用前皮膚測試 | FDA Hair Dyes | Do a patch test on your skin every time before dyeing your hair. |
| 沒反應仍可能染髮時出現反應 | FDA Hair Dyes | Even if you don't see a reaction to the skin test, it's still possible to have a reaction when you dye your hair. |
| 皮膚測試具體說明（此頁面特有） | FDA Q&A: Hair Dyes | Rub a tiny bit of the dye on the inside of your elbow or behind your ear. Leave it there for two days. If you get a rash, don't use the dye on your hair. |
本文整理自美國FDA消費者衛教頁面，為美國官方消費者衛教資訊，不代表台灣法規立場，不是全面科學文獻評估，不構成醫療診斷。如染髮後出現不適，請諮詢醫療人員，並可依FDA說明向相關單位通報。本文兩份來源均為同一機關（美國FDA）之不同頁面，不代表兩份獨立研究或完整文獻回顧。