I've already put it in the garbage so maybe a picture next time. The urate is mostly white possibly with a bit of yellow.
You may wish to consider the type and frequency of your supplements. Too much D3, too many vitamins? That schedule also depends upon the diet you feed your feeders. This info quoted from a respected exotics veterinarian may help.
#105---Yellow Urates: Potential Causes......January 2015
Contributed by a vet who also keeps leopard geckos:
"Urate color depends upon things like diet, health,
et cetera. Generally urates are very white. More pigmented (especially green) urates can indicate an issue. It is possible that if the animal has not passed stool or urates for some time there can be a little staining of the urate portion of the waste products. I also think that this is sometimes the case if the stool is loose. Then there is a greater chance for pigments to bleed from feces to urates. If it is just little off-color I would keep an eye on it and if it is infrequent I wouldn’t worry. If we are talking dark yellow or green that's biliverdin and it implies that there is something more serious going on.
Reptiles lack an enzyme called biliverdin reductase that allows them to convert biliverdin to bilirubin (as mammals do). So their bile is green. If the liver cannot handle removing it from the bloodstream efficiently, levels can exceed the renal threshold and spill into the urates. That would result in the urates being a greenish yellow to green color. What confounds this is that there's some mixing of feces and urine/urates in the cloaca so that some fecal pigments can stain the urates a light yellow color."