Thats why I suggested testing. Companies might disregard certain cheap dyes because they aren't very effecient or do not have a great shelf life. I hate to reinvent the wheel but we are stuck with the materials that are available to us.
Originally Posted by Gerald Koch
Just because something is a dye does not mean that it will act as a sensitizer. Sensitizing dyes are very expensive and if there were cheap alternatives then companies would be using them.