If the rice you buy online has a slight yellow color, it may be because it has been stored for a longer period of time, or it may be a problem with the variety of rice. However, if this yellow color is noticeable or the rice has gone bad, it is not recommended.

Here are some ways to determine if rice is edible:

1. Smell. Normal rice should have no odor, if you smell a pungent odor, it means the rice may have gone bad.

2. Look at the color. The normal color of rice should be white or light yellow, if the color of rice is too yellow, or there are signs of mold, it is not recommended to eat.

3. Touch the texture. Normal rice should have a certain degree of hardness and elasticity, if the texture of the rice is too fluffy, or there are signs of insect infestation, it is not recommended to eat.

4. Taste it after cooking. If you're not sure if this rice is edible, try cooking it and tasting it for any off-flavors or odors.

In summary, if the rice you buy online has a slight yellow color but no obvious odor or signs of spoilage, try cooking it and tasting it. If there is an odor or signs of spoilage, it is not recommended.