What kind of test was this? With a marquis reagent
should turn a pale violet. At least on a reagent, nothing in the opiate
family turns any sort of yellow to the best of my knowledge. I believe yellow tends to point towards amphetamines, depending on what kind of test you are using.
The only other thing you can do is check a pill ID, but obviously this is not a fool-proof method. Both of those imprints are legitimate, yet the color is strange.
However, DF is not a pill ID site. Asking for identification of substances is against the rules
. We can try to help out with your testing questions, as I have done to the best of my knowledge, but we cannot ID any substance. Obviously no one can tell you what you have through a screen.