@Debbie Day
You can just use pencil or waterproof pens to draw lines beneath (I usually draw square boxes), and paint over with your colours to see if the lines still show up clearly. That will give you an indication of the transparency.
As for series, that's used to differentiate the pricing. Series 1 will be most affordable and Series 5 will be most expensive (because they are created from rare stones or minerals).
@Debbie Day
You can just use pencil or waterproof pens to draw lines beneath (I usually draw square boxes), and paint over with your colours to see if the lines still show up clearly. That will give you an indication of the transparency.
As for series, that's used to differentiate the pricing. Series 1 will be most affordable and Series 5 will be most expensive (because they are created from rare stones or minerals).