Birds' nests which are just taken down are very dirty and smelly. Nobody will think of consuming them at all if they see the condition. Now let me show you how the birds' nests are processed so that they are edible.
Malaysia and Indonesia produce at least 800-2000kg of Cao Yan and Mao Yan. In these birds' nests, only a small amount is edible (the saliva of the bird), but they are very dirty and almost black in colour.
No one would want to consume it. So should we just waste it like that? No, there is of course a way of turning them into attractive products, which is bleaching. Some suppliers use H2O2 to get rid of the smell of second class birds nest.
H2O2 is a rather poisonous chemical, and it might cause cancer. Only some food contain small amount of SO2 and SO3 (not more than 0.00000002%) In Japan the amount of SO2 and SO3 in all sorts of food must not exceed 0.00000001.
Traditional Bird’s Nest www.YongKangBirdNest.com
Before this, the nutritional value in Cao Yan and Mao Yan is already very low. After processing using chemicals, the nutrient in the birds' nests is totally destroyed.
The birds' nests which are bleached have lost its original shape. So, businessmen turn these birds' nests into different kinds of shape. The most common shapes are leaf-shaped, strips and round shape. There are also those who dye the birds nest into yellow/ red colour, and cheat the unknown consumers by selling these birds' nests to them as Xue Yan/Jin Si Yan.