What do the numbers 11, 69, and 88 all have in common?

Question

What are the answers to all these clues and what do those answers have in common?

1. An amber tinted paste used on a wienerwurst.
2. A purple fruit
3. Besides the number of days, the months of May and August have this in common.
4. A finely feathered and polychromatic avian friend.
5. A 7 letter word for a pigment like crimson.
6. A bleached and neutral hue.

Answer 1

These numbers don't change thier value even if we look at it upside down !

Answer 2

11, 69 and 88 are the numbers which can be read same even if you turned them upside down. - Ulhas Shinde