纯银在非真空环境中变色几乎无法避免，这是纯银元素的属性决定的。
纯银变色主要是由于氧化反应，特别是与空气中的硫化氢或其他硫化物接触后，会发生化学反应生成硫化银，导致银饰颜色变深。
纯银变色的原因：
● 氧化反应：银与空气中的氧气发生反应，导致变色。
● 硫化物接触：人体自然分泌的汗液中含有微量的硫、盐分和其他物质，长时间的接触会促使银饰发生硫化反应，导致颜色变化。
● 其他因素：如接触强酸或强碱物质、紫外线照射等，也会使银饰品变黑。
值得注意的是，颜色变化是纯银识别和内在价值体现的重要部分。并不会影响它的美学价值，就像古代青铜器一样，时间的痕迹涂抹在其表面，这是神的再创作，是走过的时光的别样记录。纯银银饰与自己一起慢慢地在岁月中变化成熟，见证人生的喜怒哀乐，难道不是最最弥足珍贵的幸运吗？
当然，也许有人会觉得颜色变深会失去最初时候的靓丽。只是，我们本身不也是在时间中慢慢变样，或许失去了当初的俊朗细腻，但却换来了高贵的韵味。
再则，苗族银饰制作工艺被列入国家非物质文化遗产足以证明苗族银饰的珍贵价值，其工艺本身的价值远远超过了作为贵重金属的银的价值。
Whysilver discolors?
Puresilver discoloration in a non-vacuum environment is almost inevitable, which isdetermined by the properties of pure silver elements.
Silverdiscoloration is mainly due to oxidation reaction, especially after contactwith hydrogen sulfide or other sulfides in the air, chemical reaction willoccur to generate silver sulfide, resulting in silver jewelry color darkening.
Reasonsfor discoloration of sterling silver:
● Oxidation reaction: Silver reacts with oxygen in the air, resultingin discoloration.
● Sulfide contact: The sweat naturally secreted by the human bodycontains trace amounts of sulfur, salt and other substances. Long-term contactwill cause a vulcanization reaction in silver jewelry, resulting in colorchanges.
● Other factors: such as contact with strong acid or alkalisubstances, ultraviolet radiation, etc., will also make silver jewelry black.
Itis worth noting that color change is an important part of sterling silveridentification and intrinsic value.It does not affect its aesthetic value, justlike ancient bronzes, traces of time are painted on its surface, which is God'sre-creation, a different record of the time passed.Pure silver jewelry andtheir own slowly in the years of change mature, witness the joys and sorrows oflife, is not the most precious lucky?
Ofcourse, some people may think that darker colors lose their originalbeauty.However, we ourselves are not slowly changing in time, perhaps losingthe original handsome delicate, but in exchange for a noble charm.
Moreover,the Miao silverware making process is listed in the national intangiblecultural heritage enough to prove the precious value of Miao silverware, andthe value of its craft itself far exceeds the value of silver as a preciousmetal.
