Hello @dora.king.home, That is not mould on your seedlings at all. Those are the tiny roots hairs through which the seedlings take in water. Retired science teacher here - sorry! Please do not let them dry out or your seedlings will die. Add a sprinkling of compost to cover them up and keep them damp but not waterlogged. If you look up 'root hairs' on the internet you'll find many images to put your mind at rest.
Cacoethes: An irresistible urge to do something inadvisable
@Ladybird4 if you check I said I thought they looked like they are root hairs, but if the compost is saturated the stems will rot. (Retired scientist and RHS diploma in horticulture.)
@Allotment Boy & @Ladybird4 You are absolutely right! What an interesting journey this little pack of seeds has taken us on, fabulous to be able to now pass this detail on to my toddler now!
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you could try a packet of seeds from ebay this is a reputable company.
sprinkle them on damp kitchen roll and keep them damp, they’ll sprout in a day.
https://www.ebay.co.uk/itm/Salad-Cress-Common-Plain-2000-Seeds-Economy-Sprouting-Vegetable/331331287828?_trkparms=ispr%3D1&hash=item4d24e23b14:g:7u8AAOxyUylTWSXA&amdata=enc%3AAQAFAAACYBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkCrLl8erj3ATP5raQxjc%252F%252B5btftMBscSAEwt0fL%252FzFo%252BujmAr5zsNZ%252BH9yk30K3ZFKS3UP6f7OUOKvnzXmY%252Fu%252F%252FSd%252FveRzVYe4Yw%252BiLbRzYDI0cE5zX4jrbVEZo5ltjjtTJ6Aud7q%252B5LOf18NokLauWhimehcnIxK%252FnnyAdb3s6IyK0zlacWlIAhXShdRlt7k1AOuffiks0OXii71kNZeFFldq5EvQHxirlBaWDNnUgbDc018MOIa03HCkDEwX%252B8gVwo9HzbjH7y6jVqq%252BBF5ssc6ADMcZ7t234PMDZqcfBOIiculQ%252FhqY4Vovqek%252Fc61eowpFKeKm7qiRKOJskC0Lg1jT5WNNc3opBmRXOsfjtU1%252B2KqZsG4czY2wpOA5ZAB8VNXvdv77QZVkSDSWeuVkbcohb1hzSV5unZRrVgnb1QxmEaT1pfXss5C%252FvhdrI2cZ6Ya5sH9D0HJAqZNnd9sLZZQp8cPysbEF4uZiIOm7SLle2sFYwTTsHxKDsAmCwvjicMgpite3yeuYO%252FWu0BwACkyPUHBWM9inSAwxkl4KYy7PRlBFjxazqtMTGLlHAnJqA%252FzAOKHAV1RqD9iJWSnJEHkk%252BZhIXJ6MTWg0zGJ09rjXv2Cw2FMjU5%252BEa5ya5zQ%252BprK7kVLnuYvOF%252Fjnz1g%252BKKFUh0ZzJ1k%252F7%252FhKjBSHbrdQ%252FXpcvt5mNETzdxMX38JAr1AIGbjJUVFeTZ29jHW5rm2iWaDAAw1kYHr%252BKhxqi8gMEnpNXDp3uhsxfzqoIeX%7Ccksum%3A33133128782837fdb10beba24866813e985f6b9949f0%7Campid%3APL_CLK%7Cclp%3A2334524