I use a combination of commercial and home made decals. You can achieve white if you use white decal paper. I have used the commercial ACI decals also.
Even the window on this custom kitbashed caboose is a decal I made.
The baseball is white decal paper and is not picking up the white from the train car.
UI 1847 are woodland scenics dry rub transfer. Some more custom made (white paper) along with commercial brand decals.
Here are some custom clear decals that are picking up the yellow color from the train car.
Some fun at Easter time.
