In the trade, higher-value edible bird's nest is often grouped by colour as red, yellow or white nest.

Buyback value depends on type, condition and authenticity. The source cautions that some products marketed as red 'house nest' may be counterfeit. Edible bird's nest—also known in older usage as yan cai or yan gen—is built by swiftlets from hardened saliva with small amounts of down. A whole cup resembles a Chinese sycee: densely layered fibres form the outer wall, a looser mesh lines the inside, and the base is firm with small points at both ends. Typical cups are described as about 6–7 cm across and 3–4 cm deep.
The source names South China Sea islands and Southeast Asian countries as principal origins, and then groups harvested nests into three categories:
1. White nest: historically presented as tribute and sometimes called palace nest;
2. Feathered nest;
3. Red nest. The source reports a composition of more than 50% protein, about 30% carbohydrate and some minerals, and notes edible bird's nest's long history as a prized Chinese food. Colour alone does not establish authenticity or nutritional value.
Edible Bird's Nest Resources
(Source of text and images: Internet)
Edible Bird's Nest Selling Guide
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Preparation before selling edible bird's nest
Before edible bird's nest appraisal, you can take photos of the cup shape, color, dryness, and packaging information; after sending them via WhatsApp, we will first check whether it is complete, sufficiently dry, and whether there is any discoloration.
Kam Hoi Shing dried-seafood buyback
WhatsApp: (852) 69035182
In major areas of Hong Kong, on-site evaluation can be arranged, and the transaction is settled on the spot, with the process kept confidential.