Can anyone tell me the custom for the expression of sympathy in the Chinese culture?

Answer 1

sympathy, as in funeral wake?

if that is the case-
1) when you attend the wake, please do not wear anything red or anything bright & colorful, including gold accessories. wearing dull colors are acceptable. also, remember not to wear bright red lipstick color as well.

2) 'consolation' money should preferably be odd number, if its single digit. example: $3, $5, $7, etc.
double digit, AVOID- $66, $88

3) if you do not want to offer incense, you can just bow to the deceased.