Best Datatype for Binary Data

Hi,
We storing a Binary Data say "ù?" in oracle as String Datatype.
I have formed the query in my application to insert a record which has above string as one of the String field value.
The insertion was success but when the above string is not stored as it is but it is stored as "¿ù?" which is not a correct data.
Is this problem is because I'm using string for storing binary data?
Also please let me know what could be the best data type to store the binary data (like above data) in oracle.

Justin,
With the help of your query I identified how the bytes are stored in the memory.
I'm having VARCHAR2 datatype of size 14 in oracle when ever i store my binary data it is storing as
127,0,0,0,0,0,0,0....for 14 bytes -> So the binary equivalent is 011111111,00000000,00000000,...... And i'm ok with it.
But the problem is whenever a byte is holding the binary equivalent of 128 it is storing in the oracle as 191
eq:
Bits: 10000000 => equivalent to 128 in decimal and it is what i want to get when i query it using select, but what i'm getting in sql query is "191".
Really I'm not able to understand the relationship beween 128 and 191 binary values.
I got the above detail using the DUMP sql function.

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