翡翠品種
紫色翡翠見光死？紫羅蘭翡翠完全指南
Why Purple Jadeite Fades in Daylight: The Complete Guide to Lavender Jade
紫色翡翠喺燈光下好靚，但一出戶外就褪色——呢個'見光死'現象係點解？點樣揀一件耐戴耐放嘅紫羅蘭翡翠？呢篇文章全面解答。
紫色翡翠（行業稱'春色'或'紫羅蘭'）係翡翠中最神秘、最難捉摸嘅顏色。佢嘅紫色若隱若現，在燈光下像一片薰衣草田，在自然光下卻可能退成淡淡嘅灰紫。呢種'看得見但抓不住'嘅特質，正係佢最迷人也最令人頭痛嘅地方。
'見光死'嘅真正原因
人類眼睛只有三種視錐細胞（紅、綠、藍），無法直接感知紫色。我哋'看到'嘅紫色，其實係大腦將紅色信號同藍色信號合成嘅結果。商場燈光嘅光譜比較單一，有利於大腦合成出紫色；自然光嘅光譜複雜，會干擾呢個合成過程，導致紫色消失或減退。呢就係'見光死'嘅根本原因。
三大色系：邊種最耐戴？
| 色系 | 外觀特徵 | 見光表現 | 建議 |
|---|---|---|---|
| 藍紫色 | 紫中帶藍，色調偏冷，像薰衣草藍 | 最穩定，見光唔容易死 | 最耐買，適合日常佩戴 |
| 正紫色 | 純正紫色，最鮮豔，像紫羅蘭花 | 中等，自然光下略淡 | 視覺效果最好，但要注意見光 |
| 粉紫色 | 粉紅偏紫，極為少見，像玫瑰紫 | 最容易消失，自然光下幾乎無色 | 風險最高，謹慎購買 |
行業術語：十春九木
'十春九木'係翡翠行業對紫羅蘭翡翠嘅核心評語：十塊紫羅蘭（春色），九塊品質像木頭一樣差。顏色好（色濃）嘅紫羅蘭 → 品質差，結構粗，有霧狀纖維；品質好（種老）嘅紫羅蘭 → 顏色淡，甚至近乎無色。呢係紫羅蘭嘅天生矛盾，源於致色元素錳（Mn）同晶體結構之間嘅關係。
點解放久咗紫色會消失？
紫色嘅致色元素係錳（Mn），化學性質穩定，本身唔容易消失。但翡翠'變種'後，鐵元素（Fe）氧化令翡翠發黃發暗，或結構疏鬆令翡翠發霧，呢啲變化會蓋過紫色嘅視覺效果，令人眼無法再合成出紫色信號。
點樣揀一件耐戴耐放嘅紫羅蘭？
- 選種老嘅紫羅蘭：種老嘅翡翠抗氧化能力更強，變種速度更慢，紫色保持時間更長
- 選色濃嘅紫羅蘭：顏色足夠濃，即使輕微發黃，也唔至於完全消失
- 選藍紫色系：藍紫色係三大色系中最穩定嘅，見光死嘅程度最低
- 在自然光下觀察：購買前一定要在自然光下觀察顏色，唔好只睇燈光下嘅效果
- 理性消費：紫色翡翠中品質特別好嘅極為稀少，量力而行
💡 購買貼士：購買紫色翡翠時，一定要在自然光下觀察顏色。如果商家唔讓你拿到自然光下睇，呢本身就係一個警號。優質嘅紫羅蘭翡翠，即使在自然光下顏色略淡，也應該仍然可以見到紫色調。
References
English Version
Why Purple Jadeite Fades in Daylight: The Complete Guide to Lavender Jade
Purple jadeite (known in the trade as 'spring colour' 春色 or 'lavender' 紫羅蘭) is the most mysterious and elusive colour in the jadeite world. Its purple hue is there and yet not there — under shop lighting it resembles a field of lavender; in natural daylight it may fade to a faint, barely-there grey-purple. This quality of being 'visible but not quite graspable' is both its greatest charm and its greatest challenge.
The Real Reason Purple Fades in Daylight
The human eye has only three types of cone cells (red, green, blue) and cannot directly perceive purple. The 'purple' we see is actually the brain synthesising red and blue signals together. Shop lighting has a relatively narrow spectrum that favours this synthesis; natural daylight has a complex, broad spectrum that interferes with the synthesis process, causing the purple to disappear or diminish. This is the fundamental reason for the 'daylight death' phenomenon.
Three Colour Families: Which Is Most Durable?
| Colour Family | Visual Characteristics | Daylight Performance | Recommendation |
|---|---|---|---|
| Blue-purple | Purple with a blue tint; cool tone; like lavender blue | Most stable — least likely to fade in daylight | Best for long-term wear; most reliable purchase |
| True purple | Pure purple; most vivid; like violet flowers | Moderate — slightly paler in natural light | Best visual impact, but be aware of daylight fading |
| Pink-purple | Pink-tinged purple; extremely rare; like rose-purple | Most likely to disappear — nearly colourless in natural light | Highest risk; purchase with great caution |
Trade Wisdom: 'Ten Springs, Nine Duds'
'Ten springs, nine duds' (十春九木) is the trade's core verdict on lavender jadeite: of ten pieces of lavender (spring colour) jadeite, nine are as dull as wood in quality. Lavender with good colour (saturated) → poor quality, coarse structure, fibrous haze. Lavender with good quality (old texture) → pale colour, sometimes nearly colourless. This is lavender's inherent contradiction, rooted in the relationship between the colouring element manganese (Mn) and crystal structure.
Why Does the Purple Disappear After Years of Storage?
The colouring element in purple jadeite is manganese (Mn), which is chemically stable and does not easily disappear. However, when jadeite 'degrades' (變種), iron (Fe) oxidation causes the stone to yellow and darken, or structural loosening causes haziness — these changes mask the purple's visual effect, preventing the eye from synthesising the purple signal.
How to Choose a Durable Lavender Piece
- Choose old-texture lavender: old-texture jadeite has stronger oxidation resistance and degrades more slowly, preserving the purple longer
- Choose saturated colour: if the colour is deep enough, even slight yellowing won't cause it to disappear entirely
- Choose blue-purple: the most stable of the three colour families, least susceptible to daylight fading
- Always observe in natural light: before buying, check the colour in daylight — never judge solely by shop lighting
- Buy within your means: truly fine-quality lavender jadeite is extremely rare; be realistic about budget
💡 Buying tip: When purchasing purple jadeite, always insist on viewing it in natural daylight. If a seller won't allow you to take it outside, that itself is a warning sign. A quality lavender piece should still show a purple tint in natural light, even if slightly paler than under shop lighting.