Pastel Ceramic Beads in Porcelain

I have a batch of these cone 6 beads going in the small kiln today. I had enough glazed for two batches. The photo is from the first batch that I fired earlier this week.  The temperature outside is about the same so I am hoping the results will be the same.

The creamy vanilla beads look a bit buttery yellow in this picture but that is because they are next to the pinks and blues I think. By themselves they are not that color at all.

On all these beads, except the creamy vanilla ones, I put a purple underglaze on (Pueblo Purple by Duncan).  The underglaze turned this lovely blue color.

On the creamy vanilla rounds I put on Fern Green underglaze by Mayco. The color apparently burnt completely out.  I wonder if the beads would still be that same vanilla creamy look without the underglaze, or if it would be a completely different whitish color?  I'll have to try that next time I am firing to this temperature.  It would be a good experiment.

I was in the ceramic store last week looking at the underglazes and all the new bottles from Mayco have notes on each bottle saying what the colors do at cone 6.  My old bottles do not.  I suppose I will be writing on each bottle of my own what each underglaze does at what temperature from now on.